1391916988 has 96 divisors (see below), whose sum is σ = 3179409408. Its totient is φ = 517363200.

The previous prime is 1391916983. The next prime is 1391917001. The reversal of 1391916988 is 8896191931.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1391916983) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 696006 + ... + 698002.

It is an arithmetic number, because the mean of its divisors is an integer number (33118848).

Almost surely, 2^1391916988 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1391916988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1589704704).

1391916988 is an abundant number, since it is smaller than the sum of its proper divisors (1787492420).

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

1391916988 is a wasteful number, since it uses less digits than its factorization.

1391916988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2123 (or 2121 counting only the distinct ones).

The product of its digits is 839808, while the sum is 55.

The square root of 1391916988 is about 37308.4037181973. The cubic root of 1391916988 is about 1116.5318386358.

The spelling of 1391916988 in words is "one billion, three hundred ninety-one million, nine hundred sixteen thousand, nine hundred eighty-eight".