1391289696 has 72 divisors (see below), whose sum is σ = 4103039304. Its totient is φ = 463760640.

The previous prime is 1391289677. The next prime is 1391289719. The reversal of 1391289696 is 6969821931.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 81685 + ... + 97236.

It is an arithmetic number, because the mean of its divisors is an integer number (56986657).

Almost surely, 2^1391289696 is an apocalyptic number.

1391289696 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1391289696 is an abundant number, since it is smaller than the sum of its proper divisors (2711749608).

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

1391289696 is an equidigital number, since it uses as much as digits as its factorization.

1391289696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178946 (or 178926 counting only the distinct ones).

The product of its digits is 1259712, while the sum is 54.

The square root of 1391289696 is about 37299.9959249328. The cubic root of 1391289696 is about 1116.3640851617.

The spelling of 1391289696 in words is "one billion, three hundred ninety-one million, two hundred eighty-nine thousand, six hundred ninety-six".