391133952 has 324 divisors, whose sum is σ = 1314676272. Its totient is φ = 111513600.

The previous prime is 391133917. The next prime is 391133969. The reversal of 391133952 is 259331193.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 6412002 + ... + 6412062.

Almost surely, 2^391133952 is an apocalyptic number.

391133952 is a gapful number since it is divisible by the number (32) 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 391133952, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (657338136).

391133952 is an abundant number, since it is smaller than the sum of its proper divisors (923542320).

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

391133952 is a wasteful number, since it uses less digits than its factorization.

391133952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128 (or 100 counting only the distinct ones).

The product of its digits is 21870, while the sum is 36.

The square root of 391133952 is about 19777.1067651464. The cubic root of 391133952 is about 731.3217761673.

The spelling of 391133952 in words is "three hundred ninety-one million, one hundred thirty-three thousand, nine hundred fifty-two".