18870440 has 32 divisors (see below), whose sum is σ = 42634080. Its totient is φ = 7516992.

The previous prime is 18870389. The next prime is 18870469. The reversal of 18870440 is 4407881.

It is a junction number, because it is equal to n+sod(n) for n = 18870397 and 18870406.

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 7 ways as a sum of consecutive naturals, for example, 10487 + ... + 12153.

It is an arithmetic number, because the mean of its divisors is an integer number (1332315).

Almost surely, 2^18870440 is an apocalyptic number.

18870440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18870440 is an abundant number, since it is smaller than the sum of its proper divisors (23763640).

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

18870440 is a wasteful number, since it uses less digits than its factorization.

18870440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1961 (or 1957 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 32.

The square root of 18870440 is about 4344.0119705176. The cubic root of 18870440 is about 266.2322579962.

The spelling of 18870440 in words is "eighteen million, eight hundred seventy thousand, four hundred forty".