18966740 has 24 divisors (see below), whose sum is σ = 42894600. Its totient is φ = 7003008.

The previous prime is 18966737. The next prime is 18966757. The reversal of 18966740 is 4766981.

It can be written as a sum of positive squares in 4 ways, for example, as 4251844 + 14714896 = 2062^2 + 3836^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36215 + ... + 36734.

It is an arithmetic number, because the mean of its divisors is an integer number (1787275).

Almost surely, 2^18966740 is an apocalyptic number.

18966740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18966740 is an abundant number, since it is smaller than the sum of its proper divisors (23927860).

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

18966740 is a wasteful number, since it uses less digits than its factorization.

18966740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72971 (or 72969 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 18966740 is about 4355.0820887786. The cubic root of 18966740 is about 266.6843703524.

It can be divided in two parts, 1896 and 6740, that multiplied together give a triangular number (12779040 = T₅₀₅₅).

The spelling of 18966740 in words is "eighteen million, nine hundred sixty-six thousand, seven hundred forty".