18975649 has 16 divisors (see below), whose sum is σ = 23769216. Its totient is φ = 14716800.

The previous prime is 18975641. The next prime is 18975653. The reversal of 18975649 is 94657981.

It is not a de Polignac number, because 18975649 - 2³ = 18975641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18975641) 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, 21199 + ... + 22075.

It is an arithmetic number, because the mean of its divisors is an integer number (1485576).

Almost surely, 2^18975649 is an apocalyptic number.

It is an amenable number.

18975649 is a deficient number, since it is larger than the sum of its proper divisors (4793567).

18975649 is a wasteful number, since it uses less digits than its factorization.

18975649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1176.

The product of its digits is 544320, while the sum is 49.

The square root of 18975649 is about 4356.1047967192. The cubic root of 18975649 is about 266.7261192095.

The spelling of 18975649 in words is "eighteen million, nine hundred seventy-five thousand, six hundred forty-nine".