1391688480 has 384 divisors, whose sum is σ = 5456941056. Its totient is φ = 290304000.

The previous prime is 1391688407. The next prime is 1391688499. The reversal of 1391688480 is 848861931.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 6595575 + ... + 6595785.

It is an arithmetic number, because the mean of its divisors is an integer number (14210784).

Almost surely, 2^1391688480 is an apocalyptic number.

1391688480 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 1391688480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2728470528).

1391688480 is an abundant number, since it is smaller than the sum of its proper divisors (4065252576).

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

1391688480 is a wasteful number, since it uses less digits than its factorization.

1391688480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400 (or 392 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 48.

The square root of 1391688480 is about 37305.3411725453. The cubic root of 1391688480 is about 1116.4707357533.

The spelling of 1391688480 in words is "one billion, three hundred ninety-one million, six hundred eighty-eight thousand, four hundred eighty".