18961975 has 12 divisors (see below), whose sum is σ = 23812960. Its totient is φ = 14976000.

The previous prime is 18961961. The next prime is 18961993. The reversal of 18961975 is 57916981.

It is a happy number.

It is not a de Polignac number, because 18961975 - 2⁷ = 18961847 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2826 + ... + 6775.

Almost surely, 2^18961975 is an apocalyptic number.

18961975 is a deficient number, since it is larger than the sum of its proper divisors (4850985).

18961975 is an equidigital number, since it uses as much as digits as its factorization.

18961975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9690 (or 9685 counting only the distinct ones).

The product of its digits is 136080, while the sum is 46.

The square root of 18961975 is about 4354.5349923959. The cubic root of 18961975 is about 266.6620355098.

The spelling of 18961975 in words is "eighteen million, nine hundred sixty-one thousand, nine hundred seventy-five".