23919840 has 288 divisors, whose sum is σ = 98249760. Its totient is φ = 5419008.

The previous prime is 23919821. The next prime is 23919859. The reversal of 23919840 is 4891932.

It is an interprime number because it is at equal distance from previous prime (23919821) and next prime (23919859).

It is a tau number, because it is divible by the number of its divisors (288).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 23919795 and 23919804.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 211624 + ... + 211736.

It is an arithmetic number, because the mean of its divisors is an integer number (341145).

Almost surely, 2^23919840 is an apocalyptic number.

23919840 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 23919840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49124880).

23919840 is an abundant number, since it is smaller than the sum of its proper divisors (74329920).

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

23919840 is a wasteful number, since it uses less digits than its factorization.

23919840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151 (or 130 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 23919840 is about 4890.7913470112. The cubic root of 23919840 is about 288.1284149554.

The spelling of 23919840 in words is "twenty-three million, nine hundred nineteen thousand, eight hundred forty".