18039836 has 24 divisors (see below), whose sum is σ = 32535216. Its totient is φ = 8746880.

The previous prime is 18039823. The next prime is 18039871. The reversal of 18039836 is 63893081.

18039836 = T₁₃₃ + T₁₃₄ + ... + T₄₇₉.

It is a self number, because there is not a number n which added to its sum of digits gives 18039836.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51815 + ... + 52161.

It is an arithmetic number, because the mean of its divisors is an integer number (1355634).

Almost surely, 2^18039836 is an apocalyptic number.

It is an amenable number.

18039836 is a deficient number, since it is larger than the sum of its proper divisors (14495380).

18039836 is a wasteful number, since it uses less digits than its factorization.

18039836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 709 (or 707 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 18039836 is about 4247.3328101292. The cubic root of 18039836 is about 262.2673300368.

The spelling of 18039836 in words is "eighteen million, thirty-nine thousand, eight hundred thirty-six".