18475988 has 12 divisors (see below), whose sum is σ = 32403840. Its totient is φ = 9217752.

The previous prime is 18475981. The next prime is 18475993. The reversal of 18475988 is 88957481.

It is a super-2 number, since 2×18475988² = 682724265152288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18475981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2906 + ... + 6737.

It is an arithmetic number, because the mean of its divisors is an integer number (2700320).

Almost surely, 2^18475988 is an apocalyptic number.

It is an amenable number.

18475988 is a deficient number, since it is larger than the sum of its proper divisors (13927852).

18475988 is a wasteful number, since it uses less digits than its factorization.

18475988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10126 (or 10124 counting only the distinct ones).

The product of its digits is 645120, while the sum is 50.

The square root of 18475988 is about 4298.3703888800. The cubic root of 18475988 is about 264.3641477735.

The spelling of 18475988 in words is "eighteen million, four hundred seventy-five thousand, nine hundred eighty-eight".