18997902 has 80 divisors (see below), whose sum is σ = 53108352. Its totient is φ = 4931280.

The previous prime is 18997897. The next prime is 18997919. The reversal of 18997902 is 20979981.

It is a congruent number.

It is an unprimeable number.

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 39 ways as a sum of consecutive naturals, for example, 11713 + ... + 13235.

Almost surely, 2^18997902 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18997902, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26554176).

18997902 is an abundant number, since it is smaller than the sum of its proper divisors (34110450).

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

18997902 is a wasteful number, since it uses less digits than its factorization.

18997902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1555 (or 1546 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 45.

The square root of 18997902 is about 4358.6582797921. The cubic root of 18997902 is about 266.8303429200.

It can be divided in two parts, 1899 and 7902, that added together give a square (9801 = 99²).

The spelling of 18997902 in words is "eighteen million, nine hundred ninety-seven thousand, nine hundred two".