1256320340 has 48 divisors (see below), whose sum is σ = 2939376384. Its totient is φ = 447120000.

The previous prime is 1256320333. The next prime is 1256320361. The reversal of 1256320340 is 430236521.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50411 + ... + 71090.

It is an arithmetic number, because the mean of its divisors is an integer number (61237008).

Almost surely, 2^1256320340 is an apocalyptic number.

1256320340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1256320340 is an abundant number, since it is smaller than the sum of its proper divisors (1683056044).

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

1256320340 is a wasteful number, since it uses less digits than its factorization.

1256320340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121568 (or 121566 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 1256320340 is about 35444.6094632174. The cubic root of 1256320340 is about 1079.0298615474.

Adding to 1256320340 its reverse (430236521), we get a palindrome (1686556861).

The spelling of 1256320340 in words is "one billion, two hundred fifty-six million, three hundred twenty thousand, three hundred forty".