1279387040 has 48 divisors (see below), whose sum is σ = 3181641120. Its totient is φ = 484819200.

The previous prime is 1279387009. The next prime is 1279387049. The reversal of 1279387040 is 407839721.

1279387040 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (1279387049) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 207386 + ... + 213465.

It is an arithmetic number, because the mean of its divisors is an integer number (66284190).

Almost surely, 2^1279387040 is an apocalyptic number.

1279387040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1279387040 is an abundant number, since it is smaller than the sum of its proper divisors (1902254080).

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

1279387040 is a wasteful number, since it uses less digits than its factorization.

1279387040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420885 (or 420877 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 41.

The square root of 1279387040 is about 35768.5202377733. The cubic root of 1279387040 is about 1085.5937034003.

The spelling of 1279387040 in words is "one billion, two hundred seventy-nine million, three hundred eighty-seven thousand, forty".