18503814 has 16 divisors (see below), whose sum is σ = 42294528. Its totient is φ = 5286792.

The previous prime is 18503789. The next prime is 18503839. The reversal of 18503814 is 41830581.

It is an interprime number because it is at equal distance from previous prime (18503789) and next prime (18503839).

It is a super-2 number, since 2×18503814² = 684782265093192, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 220242 + ... + 220325.

It is an arithmetic number, because the mean of its divisors is an integer number (2643408).

Almost surely, 2^18503814 is an apocalyptic number.

18503814 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

18503814 is an abundant number, since it is smaller than the sum of its proper divisors (23790714).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18503814 is a wasteful number, since it uses less digits than its factorization.

18503814 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440579.

The product of its (nonzero) digits is 3840, while the sum is 30.

The square root of 18503814 is about 4301.6059791664. The cubic root of 18503814 is about 264.4967975475.

The spelling of 18503814 in words is "eighteen million, five hundred three thousand, eight hundred fourteen".