18831265 has 4 divisors (see below), whose sum is σ = 22597524. Its totient is φ = 15065008.

The previous prime is 18831247. The next prime is 18831269. The reversal of 18831265 is 56213881.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56213881 = 31 ⋅1813351.

It can be written as a sum of positive squares in 2 ways, for example, as 10093329 + 8737936 = 3177^2 + 2956^2 .

It is a cyclic number.

It is not a de Polignac number, because 18831265 - 2¹³ = 18823073 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18831265.

It is not an unprimeable number, because it can be changed into a prime (18831269) 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, 1883122 + ... + 1883131.

It is an arithmetic number, because the mean of its divisors is an integer number (5649381).

Almost surely, 2^18831265 is an apocalyptic number.

It is an amenable number.

18831265 is a deficient number, since it is larger than the sum of its proper divisors (3766259).

18831265 is an equidigital number, since it uses as much as digits as its factorization.

18831265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3766258.

The product of its digits is 11520, while the sum is 34.

The square root of 18831265 is about 4339.5005472980. The cubic root of 18831265 is about 266.0478977949.

It can be divided in two parts, 1883126 and 5, that multiplied together give a triangular number (9415630 = T₄₃₃₉).

The spelling of 18831265 in words is "eighteen million, eight hundred thirty-one thousand, two hundred sixty-five".