18039290 has 16 divisors (see below), whose sum is σ = 32639112. Its totient is φ = 7178304.

The previous prime is 18039277. The next prime is 18039299. The reversal of 18039290 is 9293081.

It can be written as a sum of positive squares in 4 ways, for example, as 15928081 + 2111209 = 3991^2 + 1453^2 .

It is not an unprimeable number, because it can be changed into a prime (18039299) 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, 2609 + ... + 6548.

Almost surely, 2^18039290 is an apocalyptic number.

18039290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18039290 is a deficient number, since it is larger than the sum of its proper divisors (14599822).

18039290 is a wasteful number, since it uses less digits than its factorization.

18039290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9361.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 18039290 is about 4247.2685340110. The cubic root of 18039290 is about 262.2646840518.

The spelling of 18039290 in words is "eighteen million, thirty-nine thousand, two hundred ninety".