18642998 has 16 divisors (see below), whose sum is σ = 31559760. Its totient is φ = 8181600.

The previous prime is 18642983. The next prime is 18643007. The reversal of 18642998 is 89924681.

It is a super-2 number, since 2×18642998² = 695122748856008, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13973 + ... + 15248.

It is an arithmetic number, because the mean of its divisors is an integer number (1972485).

Almost surely, 2^18642998 is an apocalyptic number.

18642998 is a deficient number, since it is larger than the sum of its proper divisors (12916762).

18642998 is a wasteful number, since it uses less digits than its factorization.

18642998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29263.

The product of its digits is 248832, while the sum is 47.

The square root of 18642998 is about 4317.7538141955. The cubic root of 18642998 is about 265.1583152741.

The spelling of 18642998 in words is "eighteen million, six hundred forty-two thousand, nine hundred ninety-eight".