1390380256 has 48 divisors (see below), whose sum is σ = 2852236800. Its totient is φ = 666426240.

The previous prime is 1390380223. The next prime is 1390380269. The reversal of 1390380256 is 6520830931.

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, 99595 + ... + 112693.

It is an arithmetic number, because the mean of its divisors is an integer number (59421600).

Almost surely, 2^1390380256 is an apocalyptic number.

1390380256 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1390380256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1426118400).

1390380256 is an abundant number, since it is smaller than the sum of its proper divisors (1461856544).

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

1390380256 is a wasteful number, since it uses less digits than its factorization.

1390380256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13247 (or 13239 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 1390380256 is about 37287.8030460364. The cubic root of 1390380256 is about 1116.1207887315.

The spelling of 1390380256 in words is "one billion, three hundred ninety million, three hundred eighty thousand, two hundred fifty-six".