18377213 has 8 divisors (see below), whose sum is σ = 19143000. Its totient is φ = 17620288.

The previous prime is 18377201. The next prime is 18377231. The reversal of 18377213 is 31277381.

It can be written as a sum of positive squares in 4 ways, for example, as 33124 + 18344089 = 182^2 + 4283^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18377213 - 2⁸ = 18376957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18377213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18377263) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2195 + ... + 6447.

It is an arithmetic number, because the mean of its divisors is an integer number (2392875).

Almost surely, 2^18377213 is an apocalyptic number.

It is an amenable number.

18377213 is a deficient number, since it is larger than the sum of its proper divisors (765787).

18377213 is a wasteful number, since it uses less digits than its factorization.

18377213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4431.

The product of its digits is 7056, while the sum is 32.

The square root of 18377213 is about 4286.8651716610. The cubic root of 18377213 is about 263.8921975299.

The spelling of 18377213 in words is "eighteen million, three hundred seventy-seven thousand, two hundred thirteen".