18996840 has 48 divisors (see below), whose sum is σ = 61740900. Its totient is φ = 5065728.

The previous prime is 18996839. The next prime is 18996851. The reversal of 18996840 is 4869981.

It can be written as a sum of positive squares in 2 ways, for example, as 18301284 + 695556 = 4278^2 + 834^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26025 + ... + 26744.

Almost surely, 2^18996840 is an apocalyptic number.

18996840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18996840 is an abundant number, since it is smaller than the sum of its proper divisors (42744060).

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

18996840 is a wasteful number, since it uses less digits than its factorization.

18996840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52786 (or 52779 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The square root of 18996840 is about 4358.5364516085. The cubic root of 18996840 is about 266.8253708078.

The spelling of 18996840 in words is "eighteen million, nine hundred ninety-six thousand, eight hundred forty".