18999902 has 4 divisors (see below), whose sum is σ = 28499856. Its totient is φ = 9499950.

The previous prime is 18999889. The next prime is 18999913. The reversal of 18999902 is 20999981.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4749974 + ... + 4749977.

It is an arithmetic number, because the mean of its divisors is an integer number (7124964).

Almost surely, 2^18999902 is an apocalyptic number.

18999902 is a deficient number, since it is larger than the sum of its proper divisors (9499954).

18999902 is an equidigital number, since it uses as much as digits as its factorization.

18999902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9499953.

The product of its (nonzero) digits is 104976, while the sum is 47.

The square root of 18999902 is about 4358.8877021552. The cubic root of 18999902 is about 266.8397060936.

The spelling of 18999902 in words is "eighteen million, nine hundred ninety-nine thousand, nine hundred two".