18043431 has 16 divisors (see below), whose sum is σ = 28690944. Its totient is φ = 9861984.

The previous prime is 18043393. The next prime is 18043469. The reversal of 18043431 is 13434081.

It is an interprime number because it is at equal distance from previous prime (18043393) and next prime (18043469).

It is not a de Polignac number, because 18043431 - 2¹¹ = 18041383 is a prime.

It is a super-2 number, since 2×18043431² = 651130804503522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18043471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18196 + ... + 19161.

It is an arithmetic number, because the mean of its divisors is an integer number (1793184).

Almost surely, 2^18043431 is an apocalyptic number.

18043431 is a deficient number, since it is larger than the sum of its proper divisors (10647513).

18043431 is a wasteful number, since it uses less digits than its factorization.

18043431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37390.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 18043431 is about 4247.7559958171. The cubic root of 18043431 is about 262.2847505282.

The spelling of 18043431 in words is "eighteen million, forty-three thousand, four hundred thirty-one".