18872740 has 12 divisors (see below), whose sum is σ = 39632796. Its totient is φ = 7549088.

The previous prime is 18872677. The next prime is 18872753. The reversal of 18872740 is 4727881.

It can be written as a sum of positive squares in 2 ways, for example, as 8988004 + 9884736 = 2998^2 + 3144^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18872740.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 471799 + ... + 471838.

It is an arithmetic number, because the mean of its divisors is an integer number (3302733).

Almost surely, 2^18872740 is an apocalyptic number.

18872740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18872740 is an abundant number, since it is smaller than the sum of its proper divisors (20760056).

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

18872740 is a wasteful number, since it uses less digits than its factorization.

18872740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 943646 (or 943644 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 37.

The square root of 18872740 is about 4344.2766946869. The cubic root of 18872740 is about 266.2430740188.

The spelling of 18872740 in words is "eighteen million, eight hundred seventy-two thousand, seven hundred forty".