18890855 has 16 divisors (see below), whose sum is σ = 23113728. Its totient is φ = 14820000.

The previous prime is 18890819. The next prime is 18890881. The reversal of 18890855 is 55809881.

It is a de Polignac number, because none of the positive numbers 2^k-18890855 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 98810 + ... + 99000.

It is an arithmetic number, because the mean of its divisors is an integer number (1444608).

Almost surely, 2^18890855 is an apocalyptic number.

18890855 is a deficient number, since it is larger than the sum of its proper divisors (4222873).

18890855 is a wasteful number, since it uses less digits than its factorization.

18890855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 478.

The product of its (nonzero) digits is 115200, while the sum is 44.

The square root of 18890855 is about 4346.3611216741. The cubic root of 18890855 is about 266.3282312525.

The spelling of 18890855 in words is "eighteen million, eight hundred ninety thousand, eight hundred fifty-five".