393951 has 4 divisors (see below), whose sum is σ = 525272. Its totient is φ = 262632.

The previous prime is 393947. The next prime is 393961. The reversal of 393951 is 159393.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 393951 - 2² = 393947 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (393901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65656 + ... + 65661.

It is an arithmetic number, because the mean of its divisors is an integer number (131318).

2³⁹³⁹⁵¹ is an apocalyptic number.

393951 is a deficient number, since it is larger than the sum of its proper divisors (131321).

393951 is a wasteful number, since it uses less digits than its factorization.

393951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131320.

The product of its digits is 3645, while the sum is 30.

The square root of 393951 is about 627.6551600999. The cubic root of 393951 is about 73.3073300827.

The spelling of 393951 in words is "three hundred ninety-three thousand, nine hundred fifty-one".