1279905492 has 48 divisors (see below), whose sum is σ = 3080118272. Its totient is φ = 413411040.

The previous prime is 1279905491. The next prime is 1279905509. The reversal of 1279905492 is 2945099721.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1279905491) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55767 + ... + 75297.

Almost surely, 2^1279905492 is an apocalyptic number.

1279905492 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1279905492 is an abundant number, since it is smaller than the sum of its proper divisors (1800212780).

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

1279905492 is a wasteful number, since it uses less digits than its factorization.

1279905492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19708 (or 19706 counting only the distinct ones).

The product of its (nonzero) digits is 408240, while the sum is 48.

The square root of 1279905492 is about 35775.7668261632. The cubic root of 1279905492 is about 1085.7403236698.

The spelling of 1279905492 in words is "one billion, two hundred seventy-nine million, nine hundred five thousand, four hundred ninety-two".