391390487040 has 480 divisors, whose sum is σ = 1491067315584. Its totient is φ = 87275274240.

The previous prime is 391390487021. The next prime is 391390487051. The reversal of 391390487040 is 40784093193.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (480).

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 15416437 + ... + 15441803.

Almost surely, 2^391390487040 is an apocalyptic number.

391390487040 is a gapful number since it is divisible by the number (30) 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 391390487040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (745533657792).

391390487040 is an abundant number, since it is smaller than the sum of its proper divisors (1099676828544).

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

391390487040 is a wasteful number, since it uses less digits than its factorization.

391390487040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25448 (or 25425 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 48.

The spelling of 391390487040 in words is "three hundred ninety-one billion, three hundred ninety million, four hundred eighty-seven thousand, forty".