18289313 has 4 divisors (see below), whose sum is σ = 20902080. Its totient is φ = 15676548.

The previous prime is 18289307. The next prime is 18289357. The reversal of 18289313 is 31398281.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31398281 = 1427 ⋅22003.

It is a cyclic number.

It is not a de Polignac number, because 18289313 - 2¹⁸ = 18027169 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18289373) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1306373 + ... + 1306386.

It is an arithmetic number, because the mean of its divisors is an integer number (5225520).

Almost surely, 2^18289313 is an apocalyptic number.

It is an amenable number.

18289313 is a deficient number, since it is larger than the sum of its proper divisors (2612767).

18289313 is an equidigital number, since it uses as much as digits as its factorization.

18289313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2612766.

The product of its digits is 10368, while the sum is 35.

The square root of 18289313 is about 4276.6006360192. The cubic root of 18289313 is about 263.4707842311.

The spelling of 18289313 in words is "eighteen million, two hundred eighty-nine thousand, three hundred thirteen".