1391291712 has 84 divisors (see below), whose sum is σ = 4161312480. Its totient is φ = 443596032.

The previous prime is 1391291683. The next prime is 1391291717. The reversal of 1391291712 is 2171921931.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1391291717) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39262 + ... + 65757.

Almost surely, 2^1391291712 is an apocalyptic number.

1391291712 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1391291712 is an abundant number, since it is smaller than the sum of its proper divisors (2770020768).

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

1391291712 is a wasteful number, since it uses less digits than its factorization.

1391291712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105060 (or 105047 counting only the distinct ones).

The product of its digits is 6804, while the sum is 36.

The square root of 1391291712 is about 37300.0229490546. The cubic root of 1391291712 is about 1116.3646243710.

The spelling of 1391291712 in words is "one billion, three hundred ninety-one million, two hundred ninety-one thousand, seven hundred twelve".