23909400440 has 64 divisors (see below), whose sum is σ = 57103328160. Its totient is φ = 8978636800.

The previous prime is 23909400343. The next prime is 23909400497. The reversal of 23909400440 is 4400490932.

It is a self number, because there is not a number n which added to its sum of digits gives 23909400440.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 228839 + ... + 316521.

Almost surely, 2^23909400440 is an apocalyptic number.

23909400440 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 23909400440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28551664080).

23909400440 is an abundant number, since it is smaller than the sum of its proper divisors (33193927720).

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

23909400440 is a wasteful number, since it uses less digits than its factorization.

23909400440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88112 (or 88108 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 35.

The spelling of 23909400440 in words is "twenty-three billion, nine hundred nine million, four hundred thousand, four hundred forty".