1276684920 has 192 divisors, whose sum is σ = 4948369920. Its totient is φ = 279113472.

The previous prime is 1276684883. The next prime is 1276684939. The reversal of 1276684920 is 294866721.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 46947 + ... + 68973.

It is an arithmetic number, because the mean of its divisors is an integer number (25772760).

Almost surely, 2^1276684920 is an apocalyptic number.

1276684920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1276684920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2474184960).

1276684920 is an abundant number, since it is smaller than the sum of its proper divisors (3671685000).

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

1276684920 is a wasteful number, since it uses less digits than its factorization.

1276684920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22074 (or 22067 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The square root of 1276684920 is about 35730.7279522822. The cubic root of 1276684920 is about 1084.8288913064.

The spelling of 1276684920 in words is "one billion, two hundred seventy-six million, six hundred eighty-four thousand, nine hundred twenty".