18860538 has 16 divisors (see below), whose sum is σ = 38095776. Its totient is φ = 6224400.

The previous prime is 18860509. The next prime is 18860551. The reversal of 18860538 is 83506881.

It is a happy number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 18860496 and 18860505.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14956 + ... + 16167.

It is an arithmetic number, because the mean of its divisors is an integer number (2380986).

Almost surely, 2^18860538 is an apocalyptic number.

18860538 is an abundant number, since it is smaller than the sum of its proper divisors (19235238).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18860538 is a wasteful number, since it uses less digits than its factorization.

18860538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31229.

The product of its (nonzero) digits is 46080, while the sum is 39.

The square root of 18860538 is about 4342.8720911397. The cubic root of 18860538 is about 266.1856826282.

It can be divided in two parts, 188 and 60538, that added together give a triangular number (60726 = T₃₄₈).

The spelling of 18860538 in words is "eighteen million, eight hundred sixty thousand, five hundred thirty-eight".