186390940 has 12 divisors (see below), whose sum is σ = 391421016. Its totient is φ = 74556368.

The previous prime is 186390937. The next prime is 186390943. The reversal of 186390940 is 49093681.

It is an interprime number because it is at equal distance from previous prime (186390937) and next prime (186390943).

It is a junction number, because it is equal to n+sod(n) for n = 186390893 and 186390902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (186390943) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 4659754 + ... + 4659793.

It is an arithmetic number, because the mean of its divisors is an integer number (32618418).

Almost surely, 2^186390940 is an apocalyptic number.

186390940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

186390940 is an abundant number, since it is smaller than the sum of its proper divisors (205030076).

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

186390940 is a wasteful number, since it uses less digits than its factorization.

186390940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9319556 (or 9319554 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 186390940 is about 13652.5067295351. The cubic root of 186390940 is about 571.2263940117.

The spelling of 186390940 in words is "one hundred eighty-six million, three hundred ninety thousand, nine hundred forty".