1279404720 has 480 divisors, whose sum is σ = 5043677184. Its totient is φ = 298598400.

The previous prime is 1279404703. The next prime is 1279404769. The reversal of 1279404720 is 274049721.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 6628944 + ... + 6629136.

Almost surely, 2^1279404720 is an apocalyptic number.

1279404720 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 1279404720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2521838592).

1279404720 is an abundant number, since it is smaller than the sum of its proper divisors (3764272464).

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

1279404720 is a wasteful number, since it uses less digits than its factorization.

1279404720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263 (or 245 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 36.

The square root of 1279404720 is about 35768.7673816138. The cubic root of 1279404720 is about 1085.5987040263.

The spelling of 1279404720 in words is "one billion, two hundred seventy-nine million, four hundred four thousand, seven hundred twenty".