18530940 has 24 divisors (see below), whose sum is σ = 51886800. Its totient is φ = 4941568.

The previous prime is 18530933. The next prime is 18530959. The reversal of 18530940 is 4903581.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 18530898 and 18530907.

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, 154365 + ... + 154484.

It is an arithmetic number, because the mean of its divisors is an integer number (2161950).

Almost surely, 2^18530940 is an apocalyptic number.

18530940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18530940 is an abundant number, since it is smaller than the sum of its proper divisors (33355860).

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

18530940 is a wasteful number, since it uses less digits than its factorization.

18530940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308861 (or 308859 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 18530940 is about 4304.7578329100. The cubic root of 18530940 is about 264.6259823920.

It can be divided in two parts, 185 and 30940, that added together give a triangular number (31125 = T₂₄₉).

The spelling of 18530940 in words is "eighteen million, five hundred thirty thousand, nine hundred forty".