399402 has 12 divisors (see below), whose sum is σ = 865410. Its totient is φ = 133128.

The previous prime is 399401. The next prime is 399403. The reversal of 399402 is 204993.

It is an interprime number because it is at equal distance from previous prime (399401) and next prime (399403).

It can be written as a sum of positive squares in only one way, i.e., 314721 + 84681 = 561^2 + 291^2 .

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (399401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11077 + ... + 11112.

2³⁹⁹⁴⁰² is an apocalyptic number.

399402 is an abundant number, since it is smaller than the sum of its proper divisors (466008).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

399402 is a wasteful number, since it uses less digits than its factorization.

399402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22197 (or 22194 counting only the distinct ones).

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

The square root of 399402 is about 631.9825946970. The cubic root of 399402 is about 73.6438941461.

The spelling of 399402 in words is "three hundred ninety-nine thousand, four hundred two".