18890051 has 4 divisors (see below), whose sum is σ = 18902400. Its totient is φ = 18877704.

The previous prime is 18890033. The next prime is 18890057. The reversal of 18890051 is 15009881.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18890051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18890057) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3491 + ... + 7068.

It is an arithmetic number, because the mean of its divisors is an integer number (4725600).

Almost surely, 2^18890051 is an apocalyptic number.

18890051 is a deficient number, since it is larger than the sum of its proper divisors (12349).

18890051 is a wasteful number, since it uses less digits than its factorization.

18890051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12348.

The product of its (nonzero) digits is 2880, while the sum is 32.

The square root of 18890051 is about 4346.2686295258. The cubic root of 18890051 is about 266.3244528646.

The spelling of 18890051 in words is "eighteen million, eight hundred ninety thousand, fifty-one".