1277894394 has 80 divisors (see below), whose sum is σ = 3312163008. Its totient is φ = 360687168.

The previous prime is 1277894383. The next prime is 1277894413. The reversal of 1277894394 is 4934987721.

1277894394 is a `hidden beast` number, since 127 + 7 + 89 + 439 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 1277894394.

It is an unprimeable number.

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 in 39 ways as a sum of consecutive naturals, for example, 87334 + ... + 100910.

Almost surely, 2^1277894394 is an apocalyptic number.

1277894394 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1277894394, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1656081504).

1277894394 is an abundant number, since it is smaller than the sum of its proper divisors (2034268614).

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

1277894394 is a wasteful number, since it uses less digits than its factorization.

1277894394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13681 (or 13672 counting only the distinct ones).

The product of its digits is 3048192, while the sum is 54.

The square root of 1277894394 is about 35747.6487898155. The cubic root of 1277894394 is about 1085.1713559200.

The spelling of 1277894394 in words is "one billion, two hundred seventy-seven million, eight hundred ninety-four thousand, three hundred ninety-four".