23999640 has 64 divisors (see below), whose sum is σ = 82287360. Its totient is φ = 5485440.

The previous prime is 23999629. The next prime is 23999659. The reversal of 23999640 is 4699932.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 23999592 and 23999601.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13446 + ... + 15125.

It is an arithmetic number, because the mean of its divisors is an integer number (1285740).

Almost surely, 2^23999640 is an apocalyptic number.

23999640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23999640 is an abundant number, since it is smaller than the sum of its proper divisors (58287720).

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

23999640 is a wasteful number, since it uses less digits than its factorization.

23999640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28592 (or 28588 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 42.

The square root of 23999640 is about 4898.9427430824. The cubic root of 23999640 is about 288.4484718047.

The spelling of 23999640 in words is "twenty-three million, nine hundred ninety-nine thousand, six hundred forty".