392921 has 8 divisors (see below), whose sum is σ = 430920. Its totient is φ = 356608.

The previous prime is 392911. The next prime is 392923. The reversal of 392921 is 129293.

It can be written as a sum of positive squares in 4 ways, for example, as 105625 + 287296 = 325^2 + 536^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 392921 - 2⁶ = 392857 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 392921.

It is not an unprimeable number, because it can be changed into a prime (392923) 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, 95 + ... + 891.

It is an arithmetic number, because the mean of its divisors is an integer number (53865).

2³⁹²⁹²¹ is an apocalyptic number.

It is an amenable number.

392921 is a deficient number, since it is larger than the sum of its proper divisors (37999).

392921 is a wasteful number, since it uses less digits than its factorization.

392921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 843.

The product of its digits is 972, while the sum is 26.

The square root of 392921 is about 626.8341088358. The cubic root of 392921 is about 73.2433860468.

It can be divided in two parts, 39292 and 1, that added together give a palindrome (39293).

The spelling of 392921 in words is "three hundred ninety-two thousand, nine hundred twenty-one".