18547940 has 12 divisors (see below), whose sum is σ = 38950716. Its totient is φ = 7419168.

The previous prime is 18547937. The next prime is 18547957. The reversal of 18547940 is 4974581.

It can be written as a sum of positive squares in 2 ways, for example, as 3118756 + 15429184 = 1766^2 + 3928^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18547894 and 18547903.

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, 463679 + ... + 463718.

It is an arithmetic number, because the mean of its divisors is an integer number (3245893).

Almost surely, 2^18547940 is an apocalyptic number.

18547940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18547940 is an abundant number, since it is smaller than the sum of its proper divisors (20402776).

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

18547940 is a wasteful number, since it uses less digits than its factorization.

18547940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 927406 (or 927404 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 18547940 is about 4306.7319396498. The cubic root of 18547940 is about 264.7068789311.

The spelling of 18547940 in words is "eighteen million, five hundred forty-seven thousand, nine hundred forty".