400902 has 16 divisors (see below), whose sum is σ = 810480. Its totient is φ = 132192.

The previous prime is 400871. The next prime is 400903. The reversal of 400902 is 209004.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400903) by changing a digit.

400902 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 348 + ... + 960.

It is an arithmetic number, because the mean of its divisors is an integer number (50655).

2⁴⁰⁰⁹⁰² is an apocalyptic number.

400902 is an abundant number, since it is smaller than the sum of its proper divisors (409578).

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

400902 is a wasteful number, since it uses less digits than its factorization.

400902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 727.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 400902 is about 633.1682240921. The cubic root of 400902 is about 73.7359716687.

Adding to 400902 its reverse (209004), we get a palindrome (609906).

The spelling of 400902 in words is "four hundred thousand, nine hundred two".