18957899 has 8 divisors (see below), whose sum is σ = 19203072. Its totient is φ = 18714600.

The previous prime is 18957893. The next prime is 18957919. The reversal of 18957899 is 99875981.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 18957899 - 2²⁰ = 17909323 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18957893) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33392 + ... + 33954.

It is an arithmetic number, because the mean of its divisors is an integer number (2400384).

Almost surely, 2^18957899 is an apocalyptic number.

18957899 is a deficient number, since it is larger than the sum of its proper divisors (245173).

18957899 is a wasteful number, since it uses less digits than its factorization.

18957899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 937.

The product of its digits is 1632960, while the sum is 56.

The square root of 18957899 is about 4354.0669494164. The cubic root of 18957899 is about 266.6429272270.

The spelling of 18957899 in words is "eighteen million, nine hundred fifty-seven thousand, eight hundred ninety-nine".