23430640 has 40 divisors (see below), whose sum is σ = 54996480. Its totient is φ = 9282816.

The previous prime is 23430619. The next prime is 23430643. The reversal of 23430640 is 4603432.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23430643) 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, 7377 + ... + 10063.

It is an arithmetic number, because the mean of its divisors is an integer number (1374912).

Almost surely, 2^23430640 is an apocalyptic number.

23430640 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 23430640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27498240).

23430640 is an abundant number, since it is smaller than the sum of its proper divisors (31565840).

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

23430640 is a wasteful number, since it uses less digits than its factorization.

23430640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2809 (or 2803 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 22.

The square root of 23430640 is about 4840.5206331551. The cubic root of 23430640 is about 286.1506370615.

The spelling of 23430640 in words is "twenty-three million, four hundred thirty thousand, six hundred forty".