18407140 has 12 divisors (see below), whose sum is σ = 38655036. Its totient is φ = 7362848.

The previous prime is 18407131. The next prime is 18407171. The reversal of 18407140 is 4170481.

It can be written as a sum of positive squares in 2 ways, for example, as 14318656 + 4088484 = 3784^2 + 2022^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 460159 + ... + 460198.

It is an arithmetic number, because the mean of its divisors is an integer number (3221253).

Almost surely, 2^18407140 is an apocalyptic number.

18407140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18407140 is an abundant number, since it is smaller than the sum of its proper divisors (20247896).

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

18407140 is a wasteful number, since it uses less digits than its factorization.

18407140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 920366 (or 920364 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 18407140 is about 4290.3542977241. The cubic root of 18407140 is about 264.0353679276.

The spelling of 18407140 in words is "eighteen million, four hundred seven thousand, one hundred forty".