18539705 has 8 divisors (see below), whose sum is σ = 22965504. Its totient is φ = 14353200.

The previous prime is 18539699. The next prime is 18539713. The reversal of 18539705 is 50793581.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18539705 - 2¹² = 18535609 is a prime.

It is a super-2 number, since 2×18539705² = 687441322974050, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59651 + ... + 59960.

It is an arithmetic number, because the mean of its divisors is an integer number (2870688).

Almost surely, 2^18539705 is an apocalyptic number.

It is an amenable number.

18539705 is a deficient number, since it is larger than the sum of its proper divisors (4425799).

18539705 is a wasteful number, since it uses less digits than its factorization.

18539705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119647.

The product of its (nonzero) digits is 37800, while the sum is 38.

The square root of 18539705 is about 4305.7757721461. The cubic root of 18539705 is about 264.6676978714.

The spelling of 18539705 in words is "eighteen million, five hundred thirty-nine thousand, seven hundred five".