18049388 has 24 divisors (see below), whose sum is σ = 37669632. Its totient is φ = 7398864.

The previous prime is 18049387. The next prime is 18049391. The reversal of 18049388 is 88394081.

It is not an unprimeable number, because it can be changed into a prime (18049387) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13370 + ... + 14657.

It is an arithmetic number, because the mean of its divisors is an integer number (1569568).

Almost surely, 2^18049388 is an apocalyptic number.

It is an amenable number.

18049388 is an abundant number, since it is smaller than the sum of its proper divisors (19620244).

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

18049388 is a wasteful number, since it uses less digits than its factorization.

18049388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28061 (or 28059 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 41.

The square root of 18049388 is about 4248.4571317126. The cubic root of 18049388 is about 262.3136116014.

The spelling of 18049388 in words is "eighteen million, forty-nine thousand, three hundred eighty-eight".