392421 has 4 divisors (see below), whose sum is σ = 523232. Its totient is φ = 261612.

The previous prime is 392389. The next prime is 392423. The reversal of 392421 is 124293.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 392421 - 2⁵ = 392389 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 (392423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65401 + ... + 65406.

It is an arithmetic number, because the mean of its divisors is an integer number (130808).

2³⁹²⁴²¹ is an apocalyptic number.

It is an amenable number.

392421 is a deficient number, since it is larger than the sum of its proper divisors (130811).

392421 is a wasteful number, since it uses less digits than its factorization.

392421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130810.

The product of its digits is 432, while the sum is 21.

The square root of 392421 is about 626.4351522704. The cubic root of 392421 is about 73.2123049576.

The spelling of 392421 in words is "three hundred ninety-two thousand, four hundred twenty-one".