18513423 has 6 divisors (see below), whose sum is σ = 26741624. Its totient is φ = 12342276.

The previous prime is 18513409. The next prime is 18513437. The reversal of 18513423 is 32431581.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18513409) and next prime (18513437).

It is not a de Polignac number, because 18513423 - 2⁸ = 18513167 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18513023) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1028515 + ... + 1028532.

Almost surely, 2^18513423 is an apocalyptic number.

18513423 is a deficient number, since it is larger than the sum of its proper divisors (8228201).

18513423 is a wasteful number, since it uses less digits than its factorization.

18513423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2057053 (or 2057050 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 18513423 is about 4302.7227426363. The cubic root of 18513423 is about 264.5425738743.

The spelling of 18513423 in words is "eighteen million, five hundred thirteen thousand, four hundred twenty-three".