18012423 has 32 divisors (see below), whose sum is σ = 28530432. Its totient is φ = 10047840.

The previous prime is 18012419. The next prime is 18012431. The reversal of 18012423 is 32421081.

It is not a de Polignac number, because 18012423 - 2² = 18012419 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18012423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18012413) 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 31 ways as a sum of consecutive naturals, for example, 51736 + ... + 52082.

It is an arithmetic number, because the mean of its divisors is an integer number (891576).

Almost surely, 2^18012423 is an apocalyptic number.

18012423 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

18012423 is a deficient number, since it is larger than the sum of its proper divisors (10518009).

18012423 is a wasteful number, since it uses less digits than its factorization.

18012423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396 (or 374 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 18012423 is about 4244.1044991847. The cubic root of 18012423 is about 262.1344171675.

It can be divided in two parts, 1801 and 2423, that added together give a palindrome (4224).

The spelling of 18012423 in words is "eighteen million, twelve thousand, four hundred twenty-three".