23421040 has 40 divisors (see below), whose sum is σ = 55621440. Its totient is φ = 9167616.

The previous prime is 23421031. The next prime is 23421049. The reversal of 23421040 is 4012432.

It is an interprime number because it is at equal distance from previous prime (23421031) and next prime (23421049).

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×23421040² = 1097090229363200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23421049) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 646 + ... + 6874.

It is an arithmetic number, because the mean of its divisors is an integer number (1390536).

Almost surely, 2^23421040 is an apocalyptic number.

23421040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 23421040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27810720).

23421040 is an abundant number, since it is smaller than the sum of its proper divisors (32200400).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

23421040 is a wasteful number, since it uses less digits than its factorization.

23421040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6289 (or 6283 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 23421040 is about 4839.5289026929. The cubic root of 23421040 is about 286.1115511840. Note that the first 3 decimals are identical.

Adding to 23421040 its reverse (4012432), we get a palindrome (27433472).

The spelling of 23421040 in words is "twenty-three million, four hundred twenty-one thousand, forty".