404239 has 4 divisors (see below), whose sum is σ = 441000. Its totient is φ = 367480.

The previous prime is 404221. The next prime is 404249. The reversal of 404239 is 932404.

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

It is a cyclic number.

It is not a de Polignac number, because 404239 - 2¹⁵ = 371471 is a prime.

It is a Duffinian number.

404239 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404249) 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, 18364 + ... + 18385.

It is an arithmetic number, because the mean of its divisors is an integer number (110250).

2⁴⁰⁴²³⁹ is an apocalyptic number.

404239 is a deficient number, since it is larger than the sum of its proper divisors (36761).

404239 is a wasteful number, since it uses less digits than its factorization.

404239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36760.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 404239 is about 635.7979238720. The cubic root of 404239 is about 73.9399927455.

The spelling of 404239 in words is "four hundred four thousand, two hundred thirty-nine".