393631 has 8 divisors (see below), whose sum is σ = 458784. Its totient is φ = 330720.

The previous prime is 393629. The next prime is 393637. The reversal of 393631 is 136393.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 393631 - 2¹ = 393629 is a prime.

It is a super-2 number, since 2×393631² = 309890728322, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 393596 and 393605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (393637) 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, 160 + ... + 901.

It is an arithmetic number, because the mean of its divisors is an integer number (57348).

2³⁹³⁶³¹ is an apocalyptic number.

393631 is a deficient number, since it is larger than the sum of its proper divisors (65153).

393631 is a wasteful number, since it uses less digits than its factorization.

393631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1121.

The product of its digits is 1458, while the sum is 25.

The square root of 393631 is about 627.4001912655. The cubic root of 393631 is about 73.2874759214.

It can be divided in two parts, 393 and 631, that added together give a 10-th power (1024 = 2¹⁰).

The spelling of 393631 in words is "three hundred ninety-three thousand, six hundred thirty-one".