385640940 has 24 divisors (see below), whose sum is σ = 1079794800. Its totient is φ = 102837568.

The previous prime is 385640921. The next prime is 385640989. The reversal of 385640940 is 49046583.

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, 3213615 + ... + 3213734.

It is an arithmetic number, because the mean of its divisors is an integer number (44991450).

Almost surely, 2^385640940 is an apocalyptic number.

385640940 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

385640940 is an abundant number, since it is smaller than the sum of its proper divisors (694153860).

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

385640940 is a wasteful number, since it uses less digits than its factorization.

385640940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6427361 (or 6427359 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 39.

The square root of 385640940 is about 19637.7427419752. The cubic root of 385640940 is about 727.8821081689.

The spelling of 385640940 in words is "three hundred eighty-five million, six hundred forty thousand, nine hundred forty".