18614431 has 4 divisors (see below), whose sum is σ = 20306664. Its totient is φ = 16922200.

The previous prime is 18614413. The next prime is 18614443. The reversal of 18614431 is 13441681.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13441681 = 11 ⋅1221971.

It is a cyclic number.

It is not a de Polignac number, because 18614431 - 2¹¹ = 18612383 is a prime.

It is a super-2 number, since 2×18614431² = 692994082907522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18614431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18614461) 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 3 ways as a sum of consecutive naturals, for example, 846100 + ... + 846121.

It is an arithmetic number, because the mean of its divisors is an integer number (5076666).

Almost surely, 2^18614431 is an apocalyptic number.

18614431 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

18614431 is a deficient number, since it is larger than the sum of its proper divisors (1692233).

18614431 is a wasteful number, since it uses less digits than its factorization.

18614431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1692232.

The product of its digits is 2304, while the sum is 28.

The square root of 18614431 is about 4314.4444601826. Note that the first 4 decimals coincide. The cubic root of 18614431 is about 265.0228104252.

The spelling of 18614431 in words is "eighteen million, six hundred fourteen thousand, four hundred thirty-one".