391552 has 64 divisors (see below), whose sum is σ = 979200. Its totient is φ = 152064.

The previous prime is 391537. The next prime is 391553. The reversal of 391552 is 255193.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391553) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17013 + ... + 17035.

It is an arithmetic number, because the mean of its divisors is an integer number (15300).

2³⁹¹⁵⁵² is an apocalyptic number.

391552 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 391552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (489600).

391552 is an abundant number, since it is smaller than the sum of its proper divisors (587648).

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

391552 is a wasteful number, since it uses less digits than its factorization.

391552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63 (or 51 counting only the distinct ones).

The product of its digits is 1350, while the sum is 25.

The square root of 391552 is about 625.7411605448. The cubic root of 391552 is about 73.1582231481.

The spelling of 391552 in words is "three hundred ninety-one thousand, five hundred fifty-two".