386655640 has 32 divisors (see below), whose sum is σ = 994258080. Its totient is φ = 132567552.

The previous prime is 386655631. The next prime is 386655641. The reversal of 386655640 is 46556683.

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (386655641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 690177 + ... + 690736.

It is an arithmetic number, because the mean of its divisors is an integer number (31070565).

Almost surely, 2^386655640 is an apocalyptic number.

It is an amenable number.

386655640 is an abundant number, since it is smaller than the sum of its proper divisors (607602440).

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

386655640 is a wasteful number, since it uses less digits than its factorization.

386655640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1380931 (or 1380927 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 43.

The square root of 386655640 is about 19663.5612237458. The cubic root of 386655640 is about 728.5199511789.

The spelling of 386655640 in words is "three hundred eighty-six million, six hundred fifty-five thousand, six hundred forty".