18861275 has 6 divisors (see below), whose sum is σ = 23388012. Its totient is φ = 15089000.

The previous prime is 18861247. The next prime is 18861277. The reversal of 18861275 is 57216881.

It is not a de Polignac number, because 18861275 - 2⁸ = 18861019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18861277) 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, 377201 + ... + 377250.

It is an arithmetic number, because the mean of its divisors is an integer number (3898002).

Almost surely, 2^18861275 is an apocalyptic number.

18861275 is a deficient number, since it is larger than the sum of its proper divisors (4526737).

18861275 is an equidigital number, since it uses as much as digits as its factorization.

18861275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 754461 (or 754456 counting only the distinct ones).

The product of its digits is 26880, while the sum is 38.

The square root of 18861275 is about 4342.9569419924. The cubic root of 18861275 is about 266.1891497667.

The spelling of 18861275 in words is "eighteen million, eight hundred sixty-one thousand, two hundred seventy-five".