391632 has 40 divisors (see below), whose sum is σ = 1041600. Its totient is φ = 126720.

The previous prime is 391631. The next prime is 391639. The reversal of 391632 is 236193.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391631) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1869 + ... + 2067.

It is an arithmetic number, because the mean of its divisors is an integer number (26040).

2³⁹¹⁶³² 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 391632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (520800).

391632 is an abundant number, since it is smaller than the sum of its proper divisors (649968).

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

391632 is a wasteful number, since it uses less digits than its factorization.

391632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251 (or 245 counting only the distinct ones).

The product of its digits is 972, while the sum is 24.

The square root of 391632 is about 625.8050814751. The cubic root of 391632 is about 73.1632052529.

The spelling of 391632 in words is "three hundred ninety-one thousand, six hundred thirty-two".