1276842138 has 64 divisors (see below), whose sum is σ = 3064061952. Its totient is φ = 349548480.

The previous prime is 1276842121. The next prime is 1276842163. The reversal of 1276842138 is 8312486721.

It is a super-2 number, since 2×1276842138² = 3260651690744822088, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1276842138.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24495 + ... + 56157.

It is an arithmetic number, because the mean of its divisors is an integer number (47875968).

Almost surely, 2^1276842138 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1276842138, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1532030976).

1276842138 is an abundant number, since it is smaller than the sum of its proper divisors (1787219814).

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

1276842138 is a wasteful number, since it uses less digits than its factorization.

1276842138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31739.

The product of its digits is 129024, while the sum is 42.

The square root of 1276842138 is about 35732.9279236953. The cubic root of 1276842138 is about 1084.8734200766.

The spelling of 1276842138 in words is "one billion, two hundred seventy-six million, eight hundred forty-two thousand, one hundred thirty-eight".