18995556 has 12 divisors (see below), whose sum is σ = 44322992. Its totient is φ = 6331848.

The previous prime is 18995533. The next prime is 18995597. The reversal of 18995556 is 65559981.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×18995556² = 721662295498272, which contains 22 as substring.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 791470 + ... + 791493.

Almost surely, 2^18995556 is an apocalyptic number.

It is an amenable number.

18995556 is an abundant number, since it is smaller than the sum of its proper divisors (25327436).

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

18995556 is a wasteful number, since it uses less digits than its factorization.

18995556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1582970 (or 1582968 counting only the distinct ones).

The product of its digits is 486000, while the sum is 48.

The square root of 18995556 is about 4358.3891519689. The cubic root of 18995556 is about 266.8193590799.

The spelling of 18995556 in words is "eighteen million, nine hundred ninety-five thousand, five hundred fifty-six".