1256130400 has 72 divisors (see below), whose sum is σ = 3504619440. Its totient is φ = 430671360.

The previous prime is 1256130397. The next prime is 1256130401. The reversal of 1256130400 is 40316521.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1256130401) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 106555 + ... + 117754.

It is an arithmetic number, because the mean of its divisors is an integer number (48675270).

Almost surely, 2^1256130400 is an apocalyptic number.

1256130400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1256130400 is an abundant number, since it is smaller than the sum of its proper divisors (2248489040).

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

1256130400 is a wasteful number, since it uses less digits than its factorization.

1256130400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224336 (or 224323 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 1256130400 is about 35441.9299700228. The cubic root of 1256130400 is about 1078.9754801780.

Adding to 1256130400 its reverse (40316521), we get a palindrome (1296446921).

The spelling of 1256130400 in words is "one billion, two hundred fifty-six million, one hundred thirty thousand, four hundred".