408402 has 20 divisors (see below), whose sum is σ = 915486. Its totient is φ = 136080.

The previous prime is 408389. The next prime is 408403. The reversal of 408402 is 204804.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 408321 + 81 = 639^2 + 9^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (408403) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1099 + ... + 1422.

2⁴⁰⁸⁴⁰² is an apocalyptic number.

408402 is an abundant number, since it is smaller than the sum of its proper divisors (507084).

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

408402 is a wasteful number, since it uses less digits than its factorization.

408402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2535 (or 2526 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 408402 is about 639.0633771388. The cubic root of 408402 is about 74.1929466829.

The spelling of 408402 in words is "four hundred eight thousand, four hundred two".