18992890 has 48 divisors (see below), whose sum is σ = 40334112. Its totient is φ = 6419616.

The previous prime is 18992879. The next prime is 18992903. The reversal of 18992890 is 9829981.

It is a happy number.

It is a super-3 number, since 3×18992890³ (a number of 23 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18992890.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 40437 + ... + 40903.

It is an arithmetic number, because the mean of its divisors is an integer number (840294).

Almost surely, 2^18992890 is an apocalyptic number.

18992890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18992890 is an abundant number, since it is smaller than the sum of its proper divisors (21341222).

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

18992890 is a wasteful number, since it uses less digits than its factorization.

18992890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 571 (or 564 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 46.

The square root of 18992890 is about 4358.0832942935. The cubic root of 18992890 is about 266.8068759200.

The spelling of 18992890 in words is "eighteen million, nine hundred ninety-two thousand, eight hundred ninety".