23978551 has 16 divisors (see below), whose sum is σ = 27185760. Its totient is φ = 21012480.

The previous prime is 23978543. The next prime is 23978557. The reversal of 23978551 is 15587932.

It is not a de Polignac number, because 23978551 - 2³ = 23978543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23978557) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19095 + ... + 20311.

It is an arithmetic number, because the mean of its divisors is an integer number (1699110).

Almost surely, 2^23978551 is an apocalyptic number.

23978551 is a deficient number, since it is larger than the sum of its proper divisors (3207209).

23978551 is a wasteful number, since it uses less digits than its factorization.

23978551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1314.

The product of its digits is 75600, while the sum is 40.

The square root of 23978551 is about 4896.7898668413. The cubic root of 23978551 is about 288.3639584193.

The spelling of 23978551 in words is "twenty-three million, nine hundred seventy-eight thousand, five hundred fifty-one".