1312120878 has 16 divisors (see below), whose sum is σ = 2624738256. Its totient is φ = 437290880.

The previous prime is 1312120853. The next prime is 1312120879. The reversal of 1312120878 is 8780212131.

It is a super-2 number, since 2×1312120878² = 3443322396966981768, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312120879) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19750 + ... + 54902.

It is an arithmetic number, because the mean of its divisors is an integer number (164046141).

Almost surely, 2^1312120878 is an apocalyptic number.

1312120878 is an abundant number, since it is smaller than the sum of its proper divisors (1312617378).

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

1312120878 is a wasteful number, since it uses less digits than its factorization.

1312120878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41379.

The product of its (nonzero) digits is 5376, while the sum is 33.

The square root of 1312120878 is about 36223.2091068696. The cubic root of 1312120878 is about 1094.7743543720.

The spelling of 1312120878 in words is "one billion, three hundred twelve million, one hundred twenty thousand, eight hundred seventy-eight".