23817978 has 12 divisors (see below), whose sum is σ = 51605658. Its totient is φ = 7939320.

The previous prime is 23817977. The next prime is 23817979. The reversal of 23817978 is 87971832.

It is an interprime number because it is at equal distance from previous prime (23817977) and next prime (23817979).

It can be written as a sum of positive squares in only one way, i.e., 23590449 + 227529 = 4857^2 + 477^2 .

It is not an unprimeable number, because it can be changed into a prime (23817977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 661593 + ... + 661628.

Almost surely, 2^23817978 is an apocalyptic number.

23817978 is an abundant number, since it is smaller than the sum of its proper divisors (27787680).

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

23817978 is a wasteful number, since it uses less digits than its factorization.

23817978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1323229 (or 1323226 counting only the distinct ones).

The product of its digits is 169344, while the sum is 45.

The square root of 23817978 is about 4880.3665845918. The cubic root of 23817978 is about 287.7188372914.

The spelling of 23817978 in words is "twenty-three million, eight hundred seventeen thousand, nine hundred seventy-eight".