23155978 has 8 divisors (see below), whose sum is σ = 35931780. Its totient is φ = 11178720.

The previous prime is 23155919. The next prime is 23155981. The reversal of 23155978 is 87955132.

It can be written as a sum of positive squares in 2 ways, for example, as 21003889 + 2152089 = 4583^2 + 1467^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 23155978.

It is an unprimeable number.

It is an upside-down number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 199563 + ... + 199678.

Almost surely, 2^23155978 is an apocalyptic number.

23155978 is a deficient number, since it is larger than the sum of its proper divisors (12775802).

23155978 is a wasteful number, since it uses less digits than its factorization.

23155978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399272.

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

The square root of 23155978 is about 4812.0658765233. The cubic root of 23155978 is about 285.0281207504.

The spelling of 23155978 in words is "twenty-three million, one hundred fifty-five thousand, nine hundred seventy-eight".