18993396 has 24 divisors (see below), whose sum is σ = 44406880. Its totient is φ = 6318432.

The previous prime is 18993391. The next prime is 18993397. The reversal of 18993396 is 69339981.

It is a happy number.

It is a super-2 number, since 2×18993396² = 721498183225632, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18993391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6150 + ... + 8706.

Almost surely, 2^18993396 is an apocalyptic number.

It is an amenable number.

18993396 is an abundant number, since it is smaller than the sum of its proper divisors (25413484).

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

18993396 is a wasteful number, since it uses less digits than its factorization.

18993396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3183 (or 3181 counting only the distinct ones).

The product of its digits is 314928, while the sum is 48.

The square root of 18993396 is about 4358.1413469506. The cubic root of 18993396 is about 266.8092452817.

The spelling of 18993396 in words is "eighteen million, nine hundred ninety-three thousand, three hundred ninety-six".