402399 has 6 divisors (see below), whose sum is σ = 581256. Its totient is φ = 268260.

The previous prime is 402383. The next prime is 402403. The reversal of 402399 is 993204.

It is not a de Polignac number, because 402399 - 2⁴ = 402383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402329) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22347 + ... + 22364.

It is an arithmetic number, because the mean of its divisors is an integer number (96876).

2⁴⁰²³⁹⁹ is an apocalyptic number.

402399 is a deficient number, since it is larger than the sum of its proper divisors (178857).

402399 is a wasteful number, since it uses less digits than its factorization.

402399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44717 (or 44714 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 402399 is about 634.3492728773. The cubic root of 402399 is about 73.8276363325.

The spelling of 402399 in words is "four hundred two thousand, three hundred ninety-nine".