400239 has 12 divisors (see below), whose sum is σ = 660816. Its totient is φ = 228672.

The previous prime is 400237. The next prime is 400243. The reversal of 400239 is 932004.

400239 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 400239 - 2¹ = 400237 is a prime.

400239 is strictly pandigital in base 7.

400239 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400237) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3114 + ... + 3239.

It is an arithmetic number, because the mean of its divisors is an integer number (55068).

2⁴⁰⁰²³⁹ is an apocalyptic number.

400239 is a deficient number, since it is larger than the sum of its proper divisors (260577).

400239 is a wasteful number, since it uses less digits than its factorization.

400239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6366 (or 6363 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 400239 is about 632.6444499085. The cubic root of 400239 is about 73.6953017765.

The spelling of 400239 in words is "four hundred thousand, two hundred thirty-nine".