18870371 has 6 divisors (see below), whose sum is σ = 20433780. Its totient is φ = 17418648.

The previous prime is 18870367. The next prime is 18870389. The reversal of 18870371 is 17307881.

It is not a de Polignac number, because 18870371 - 2² = 18870367 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18870331) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 55661 + ... + 55998.

It is an arithmetic number, because the mean of its divisors is an integer number (3405630).

Almost surely, 2^18870371 is an apocalyptic number.

18870371 is a deficient number, since it is larger than the sum of its proper divisors (1563409).

18870371 is a wasteful number, since it uses less digits than its factorization.

18870371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111685 (or 111672 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 35.

The square root of 18870371 is about 4344.0040285433. The cubic root of 18870371 is about 266.2319335019.

Subtracting from 18870371 its sum of digits (35), we obtain a square (18870336 = 4344²).

The spelling of 18870371 in words is "eighteen million, eight hundred seventy thousand, three hundred seventy-one".