23981978 has 4 divisors (see below), whose sum is σ = 35972970. Its totient is φ = 11990988.

The previous prime is 23981959. The next prime is 23981981. The reversal of 23981978 is 87918932.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 23980609 + 1369 = 4897^2 + 37^2 .

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 as a sum of consecutive naturals, namely, 5995493 + ... + 5995496.

Almost surely, 2^23981978 is an apocalyptic number.

23981978 is a deficient number, since it is larger than the sum of its proper divisors (11990992).

23981978 is a wasteful number, since it uses less digits than its factorization.

23981978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11990991.

The product of its digits is 217728, while the sum is 47.

The square root of 23981978 is about 4897.1397774619. The cubic root of 23981978 is about 288.3776953657.

The spelling of 23981978 in words is "twenty-three million, nine hundred eighty-one thousand, nine hundred seventy-eight".