1391379140 has 24 divisors (see below), whose sum is σ = 2922984792. Its totient is φ = 556344320.

The previous prime is 1391379137. The next prime is 1391379193. The reversal of 1391379140 is 419731931.

It can be written as a sum of positive squares in 4 ways, for example, as 801569344 + 589809796 = 28312^2 + 24286^2 .

It is a super-2 number, since 2×1391379140² = 3871871822454279200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1391379094 and 1391379103.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49382 + ... + 72258.

It is an arithmetic number, because the mean of its divisors is an integer number (121791033).

Almost surely, 2^1391379140 is an apocalyptic number.

1391379140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1391379140 is an abundant number, since it is smaller than the sum of its proper divisors (1531605652).

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

1391379140 is a wasteful number, since it uses less digits than its factorization.

1391379140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25927 (or 25925 counting only the distinct ones).

The product of its (nonzero) digits is 20412, while the sum is 38.

The square root of 1391379140 is about 37301.1948870274. The cubic root of 1391379140 is about 1116.3880077926.

The spelling of 1391379140 in words is "one billion, three hundred ninety-one million, three hundred seventy-nine thousand, one hundred forty".