1279947240 has 576 divisors, whose sum is σ = 5217488640. Its totient is φ = 268139520.

The previous prime is 1279947223. The next prime is 1279947299. The reversal of 1279947240 is 427499721.

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 polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 27232897 + ... + 27232943.

It is an arithmetic number, because the mean of its divisors is an integer number (9058140).

Almost surely, 2^1279947240 is an apocalyptic number.

1279947240 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 1279947240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2608744320).

1279947240 is an abundant number, since it is smaller than the sum of its proper divisors (3937541400).

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

1279947240 is a wasteful number, since it uses less digits than its factorization.

1279947240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134 (or 104 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 45.

The square root of 1279947240 is about 35776.3502889828. The cubic root of 1279947240 is about 1085.7521284462.

The spelling of 1279947240 in words is "one billion, two hundred seventy-nine million, nine hundred forty-seven thousand, two hundred forty".