391432 has 16 divisors (see below), whose sum is σ = 742140. Its totient is φ = 193536.

The previous prime is 391403. The next prime is 391441. The reversal of 391432 is 234193.

391432 is nontrivially palindromic in base 15.

It can be written as a sum of positive squares in 2 ways, for example, as 285156 + 106276 = 534^2 + 326^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 688 + ... + 1120.

2³⁹¹⁴³² is an apocalyptic number.

It is an amenable number.

391432 is a deficient number, since it is larger than the sum of its proper divisors (350708).

391432 is a wasteful number, since it uses less digits than its factorization.

391432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 552 (or 548 counting only the distinct ones).

The product of its digits is 648, while the sum is 22.

The square root of 391432 is about 625.6452669045. The cubic root of 391432 is about 73.1507487184.

The spelling of 391432 in words is "three hundred ninety-one thousand, four hundred thirty-two".