1276013886 has 64 divisors (see below), whose sum is σ = 2975132160. Its totient is φ = 357298560.

The previous prime is 1276013839. The next prime is 1276013887. The reversal of 1276013886 is 6883106721.

It is a super-2 number, since 2×1276013886² = 3256422874529641992, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1276013887) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1141800 + ... + 1142916.

It is an arithmetic number, because the mean of its divisors is an integer number (46486440).

Almost surely, 2^1276013886 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1276013886, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1487566080).

1276013886 is an abundant number, since it is smaller than the sum of its proper divisors (1699118274).

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

1276013886 is a wasteful number, since it uses less digits than its factorization.

1276013886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1649.

The product of its (nonzero) digits is 96768, while the sum is 42.

The square root of 1276013886 is about 35721.3365651399. The cubic root of 1276013886 is about 1084.6387935943.

The spelling of 1276013886 in words is "one billion, two hundred seventy-six million, thirteen thousand, eight hundred eighty-six".