23978990 has 32 divisors (see below), whose sum is σ = 49498560. Its totient is φ = 8193024.

The previous prime is 23978989. The next prime is 23979001. The reversal of 23978990 is 9987932.

23978990 = T₁₅ + T₁₆ + ... + T₅₂₃.

It is a super-2 number, since 2×23978990² = 1149983922840200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 35294 + ... + 35966.

It is an arithmetic number, because the mean of its divisors is an integer number (1546830).

Almost surely, 2^23978990 is an apocalyptic number.

23978990 is an abundant number, since it is smaller than the sum of its proper divisors (25519570).

23978990 is a wasteful number, since it uses less digits than its factorization.

23978990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1196.

The product of its (nonzero) digits is 244944, while the sum is 47.

The square root of 23978990 is about 4896.8346919209. The cubic root of 23978990 is about 288.3657182005.

The spelling of 23978990 in words is "twenty-three million, nine hundred seventy-eight thousand, nine hundred ninety".