1391983616 has 88 divisors (see below), whose sum is σ = 2884697904. Its totient is φ = 670924800.

The previous prime is 1391983609. The next prime is 1391983633. The reversal of 1391983616 is 6163891931.

It is a happy number.

It is a congruent number.

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, 4447076 + ... + 4447388.

It is an arithmetic number, because the mean of its divisors is an integer number (32780658).

Almost surely, 2^1391983616 is an apocalyptic number.

1391983616 is a gapful number since it is divisible by the number (16) 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 1391983616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1442348952).

1391983616 is an abundant number, since it is smaller than the sum of its proper divisors (1492714288).

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

1391983616 is a wasteful number, since it uses less digits than its factorization.

1391983616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 477 (or 459 counting only the distinct ones).

The product of its digits is 209952, while the sum is 47.

The square root of 1391983616 is about 37309.2966430620. The cubic root of 1391983616 is about 1116.5496536581.

The spelling of 1391983616 in words is "one billion, three hundred ninety-one million, nine hundred eighty-three thousand, six hundred sixteen".