1256132798 has 4 divisors (see below), whose sum is σ = 1884199200. Its totient is φ = 628066398.

The previous prime is 1256132791. The next prime is 1256132809. The reversal of 1256132798 is 8972316521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8972316521 = 7 ⋅1281759503.

It is a super-2 number, since 2×1256132798² = 3155739212422617608, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1256132791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314033198 + ... + 314033201.

It is an arithmetic number, because the mean of its divisors is an integer number (471049800).

Almost surely, 2^1256132798 is an apocalyptic number.

1256132798 is a deficient number, since it is larger than the sum of its proper divisors (628066402).

1256132798 is an equidigital number, since it uses as much as digits as its factorization.

1256132798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 628066401.

The product of its digits is 181440, while the sum is 44.

The square root of 1256132798 is about 35441.9637999928. The cubic root of 1256132798 is about 1078.9761667791.

The spelling of 1256132798 in words is "one billion, two hundred fifty-six million, one hundred thirty-two thousand, seven hundred ninety-eight".