391029984 has 96 divisors (see below), whose sum is σ = 1152053280. Its totient is φ = 129024000.

The previous prime is 391029959. The next prime is 391030019. The reversal of 391029984 is 489920193.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-3 number, since 3×391029984³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85024 + ... + 89504.

It is an arithmetic number, because the mean of its divisors is an integer number (12000555).

Almost surely, 2^391029984 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 391029984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (576026640).

391029984 is an abundant number, since it is smaller than the sum of its proper divisors (761023296).

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

391029984 is a wasteful number, since it uses less digits than its factorization.

391029984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4601 (or 4587 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The square root of 391029984 is about 19774.4780967792. The cubic root of 391029984 is about 731.2569724516.

The spelling of 391029984 in words is "three hundred ninety-one million, twenty-nine thousand, nine hundred eighty-four".