18535489 has 16 divisors (see below), whose sum is σ = 22021120. Its totient is φ = 15266880.

The previous prime is 18535487. The next prime is 18535513. The reversal of 18535489 is 98453581.

It is not a de Polignac number, because 18535489 - 2¹ = 18535487 is a prime.

It is a Duffinian number.

Its product of digits (172800) is a multiple of the sum of its prime divisors (640).

It is not an unprimeable number, because it can be changed into a prime (18535487) 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, 49507 + ... + 49879.

It is an arithmetic number, because the mean of its divisors is an integer number (1376320).

Almost surely, 2^18535489 is an apocalyptic number.

It is an amenable number.

18535489 is a deficient number, since it is larger than the sum of its proper divisors (3485631).

18535489 is a wasteful number, since it uses less digits than its factorization.

18535489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 640.

The product of its digits is 172800, while the sum is 43.

The square root of 18535489 is about 4305.2861693504. The cubic root of 18535489 is about 264.6476342007.

The spelling of 18535489 in words is "eighteen million, five hundred thirty-five thousand, four hundred eighty-nine".