1279986432 has 144 divisors (see below), whose sum is σ = 3581480448. Its totient is φ = 405053440.

The previous prime is 1279986413. The next prime is 1279986443. The reversal of 1279986432 is 2346899721.

It is a super-2 number, since 2×1279986432² = 3276730532208181248, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4115557 + ... + 4115867.

It is an arithmetic number, because the mean of its divisors is an integer number (24871392).

Almost surely, 2^1279986432 is an apocalyptic number.

1279986432 is a gapful number since it is divisible by the number (12) 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 1279986432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1790740224).

1279986432 is an abundant number, since it is smaller than the sum of its proper divisors (2301494016).

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

1279986432 is a wasteful number, since it uses less digits than its factorization.

1279986432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 586 (or 572 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 51.

The square root of 1279986432 is about 35776.8980209297. The cubic root of 1279986432 is about 1085.7632102475.

The spelling of 1279986432 in words is "one billion, two hundred seventy-nine million, nine hundred eighty-six thousand, four hundred thirty-two".