18427240 has 32 divisors (see below), whose sum is σ = 44651880. Its totient is φ = 6803712.

The previous prime is 18427223. The next prime is 18427259. The reversal of 18427240 is 4272481.

It can be written as a sum of positive squares in 4 ways, for example, as 15350724 + 3076516 = 3918^2 + 1754^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18427199 and 18427208.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17199 + ... + 18238.

Almost surely, 2^18427240 is an apocalyptic number.

18427240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18427240 is an abundant number, since it is smaller than the sum of its proper divisors (26224640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18427240 is a wasteful number, since it uses less digits than its factorization.

18427240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35461 (or 35457 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 28.

The square root of 18427240 is about 4292.6961224853. The cubic root of 18427240 is about 264.1314389873.

It can be divided in two parts, 184272 and 40, that multiplied together give a triangular number (7370880 = T₃₈₃₉).

The spelling of 18427240 in words is "eighteen million, four hundred twenty-seven thousand, two hundred forty".