402090 has 32 divisors (see below), whose sum is σ = 1040256. Its totient is φ = 98880.

The previous prime is 402089. The next prime is 402091. The reversal of 402090 is 90204.

402090 is nontrivially palindromic in base 14.

It is an interprime number because it is at equal distance from previous prime (402089) and next prime (402091).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402091) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 126 + ... + 905.

It is an arithmetic number, because the mean of its divisors is an integer number (32508).

2⁴⁰²⁰⁹⁰ is an apocalyptic number.

402090 is an abundant number, since it is smaller than the sum of its proper divisors (638166).

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

402090 is a wasteful number, since it uses less digits than its factorization.

402090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1054.

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

The square root of 402090 is about 634.1056694274. The cubic root of 402090 is about 73.8087342135.

Adding to 402090 its reverse (90204), we get a palindrome (492294).

The spelling of 402090 in words is "four hundred two thousand, ninety".