18869431 has 16 divisors (see below), whose sum is σ = 22171968. Its totient is φ = 15724800.

The previous prime is 18869429. The next prime is 18869437. The reversal of 18869431 is 13496881.

It is not a de Polignac number, because 18869431 - 2¹ = 18869429 is a prime.

It is a super-2 number, since 2×18869431² = 712110852527522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18869437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67011 + ... + 67291.

It is an arithmetic number, because the mean of its divisors is an integer number (1385748).

Almost surely, 2^18869431 is an apocalyptic number.

18869431 is a deficient number, since it is larger than the sum of its proper divisors (3302537).

18869431 is a wasteful number, since it uses less digits than its factorization.

18869431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 522.

The product of its digits is 41472, while the sum is 40.

The square root of 18869431 is about 4343.8958320844. The cubic root of 18869431 is about 266.2275127768.

The spelling of 18869431 in words is "eighteen million, eight hundred sixty-nine thousand, four hundred thirty-one".