18879380 has 24 divisors (see below), whose sum is σ = 42697032. Its totient is φ = 6970752.

The previous prime is 18879359. The next prime is 18879391. The reversal of 18879380 is 8397881.

It can be written as a sum of positive squares in 4 ways, for example, as 1473796 + 17405584 = 1214^2 + 4172^2 .

It is a congruent number.

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, 36047 + ... + 36566.

It is an arithmetic number, because the mean of its divisors is an integer number (1779043).

Almost surely, 2^18879380 is an apocalyptic number.

18879380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18879380 is an abundant number, since it is smaller than the sum of its proper divisors (23817652).

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

18879380 is a wasteful number, since it uses less digits than its factorization.

18879380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72635 (or 72633 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 44.

The square root of 18879380 is about 4345.0408513615. The cubic root of 18879380 is about 266.2742944762.

The spelling of 18879380 in words is "eighteen million, eight hundred seventy-nine thousand, three hundred eighty".