390256140 has 24 divisors (see below), whose sum is σ = 1092717360. Its totient is φ = 104068288.

The previous prime is 390256133. The next prime is 390256171. The reversal of 390256140 is 41652093.

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 = 390256098 and 390256107.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 3252075 + ... + 3252194.

It is an arithmetic number, because the mean of its divisors is an integer number (45529890).

Almost surely, 2^390256140 is an apocalyptic number.

390256140 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

390256140 is an abundant number, since it is smaller than the sum of its proper divisors (702461220).

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

390256140 is a wasteful number, since it uses less digits than its factorization.

390256140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6504281 (or 6504279 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 390256140 is about 19754.9016702185. The cubic root of 390256140 is about 730.7742707458.

The spelling of 390256140 in words is "three hundred ninety million, two hundred fifty-six thousand, one hundred forty".