391969428480 has 704 divisors, whose sum is σ = 1675854336000. Its totient is φ = 84873609216.

The previous prime is 391969428479. The next prime is 391969428491. The reversal of 391969428480 is 84824969193.

391969428480 is a `hidden beast` number, since 3 + 9 + 196 + 94 + 284 + 80 = 666.

It is a super-2 number, since 2×391969428480² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

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, 18375261 + ... + 18396579.

Almost surely, 2^391969428480 is an apocalyptic number.

391969428480 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 391969428480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (837927168000).

391969428480 is an abundant number, since it is smaller than the sum of its proper divisors (1283884907520).

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

391969428480 is a wasteful number, since it uses less digits than its factorization.

391969428480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21379 (or 21355 counting only the distinct ones).

The product of its (nonzero) digits is 26873856, while the sum is 63.

The spelling of 391969428480 in words is "three hundred ninety-one billion, nine hundred sixty-nine million, four hundred twenty-eight thousand, four hundred eighty".