18761998 has 8 divisors (see below), whose sum is σ = 28235592. Its totient is φ = 9350136.

The previous prime is 18761993. The next prime is 18762011. The reversal of 18761998 is 89916781.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18761993) 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 3 ways as a sum of consecutive naturals, for example, 14665 + ... + 15892.

It is an arithmetic number, because the mean of its divisors is an integer number (3529449).

Almost surely, 2^18761998 is an apocalyptic number.

18761998 is a deficient number, since it is larger than the sum of its proper divisors (9473594).

18761998 is a wasteful number, since it uses less digits than its factorization.

18761998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30866.

The product of its digits is 217728, while the sum is 49.

The square root of 18761998 is about 4331.5122070704. The cubic root of 18761998 is about 265.7212958911.

The spelling of 18761998 in words is "eighteen million, seven hundred sixty-one thousand, nine hundred ninety-eight".