23947840 has 56 divisors (see below), whose sum is σ = 65178432. Its totient is φ = 8209920.

The previous prime is 23947829. The next prime is 23947901. The reversal of 23947840 is 4874932.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (56).

It is a self number, because there is not a number n which added to its sum of digits gives 23947840.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3106 + ... + 7585.

Almost surely, 2^23947840 is an apocalyptic number.

23947840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23947840 is an abundant number, since it is smaller than the sum of its proper divisors (41230592).

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

23947840 is a wasteful number, since it uses less digits than its factorization.

23947840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10715 (or 10705 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 23947840 is about 4893.6530322449. The cubic root of 23947840 is about 288.2407965565.

The spelling of 23947840 in words is "twenty-three million, nine hundred forty-seven thousand, eight hundred forty".