23907978 has 24 divisors (see below), whose sum is σ = 52338468. Its totient is φ = 7886592.

The previous prime is 23907941. The next prime is 23907979. The reversal of 23907978 is 87970932.

It can be written as a sum of positive squares in 2 ways, for example, as 21095649 + 2812329 = 4593^2 + 1677^2 .

It is not an unprimeable number, because it can be changed into a prime (23907979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5101 + ... + 8592.

Almost surely, 2^23907978 is an apocalyptic number.

23907978 is an abundant number, since it is smaller than the sum of its proper divisors (28430490).

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

23907978 is a wasteful number, since it uses less digits than its factorization.

23907978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13798 (or 13795 counting only the distinct ones).

The product of its (nonzero) digits is 190512, while the sum is 45.

The square root of 23907978 is about 4889.5785094423. The cubic root of 23907978 is about 288.0807788455.

The spelling of 23907978 in words is "twenty-three million, nine hundred seven thousand, nine hundred seventy-eight".