18540039 has 16 divisors (see below), whose sum is σ = 28675328. Its totient is φ = 10435392.

The previous prime is 18540031. The next prime is 18540061. The reversal of 18540039 is 93004581.

It is not a de Polignac number, because 18540039 - 2³ = 18540031 is a prime.

It is a super-2 number, since 2×18540039² = 687466092243042, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18539988 and 18540015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18540031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5182 + ... + 7995.

It is an arithmetic number, because the mean of its divisors is an integer number (1792208).

Almost surely, 2^18540039 is an apocalyptic number.

18540039 is a deficient number, since it is larger than the sum of its proper divisors (10135289).

18540039 is a wasteful number, since it uses less digits than its factorization.

18540039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13254.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 18540039 is about 4305.8145570844. The cubic root of 18540039 is about 264.6692872257.

The spelling of 18540039 in words is "eighteen million, five hundred forty thousand, thirty-nine".