1391316240 has 80 divisors (see below), whose sum is σ = 4319955648. Its totient is φ = 370426368.

The previous prime is 1391316203. The next prime is 1391316281. The reversal of 1391316240 is 426131931.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 1391316198 and 1391316207.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 158199 + ... + 166761.

Almost surely, 2^1391316240 is an apocalyptic number.

1391316240 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 1391316240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2159977824).

1391316240 is an abundant number, since it is smaller than the sum of its proper divisors (2928639408).

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

1391316240 is a wasteful number, since it uses less digits than its factorization.

1391316240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9256 (or 9250 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 1391316240 is about 37300.3517409689. The cubic root of 1391316240 is about 1116.3711847087.

The spelling of 1391316240 in words is "one billion, three hundred ninety-one million, three hundred sixteen thousand, two hundred forty".