402290 has 24 divisors (see below), whose sum is σ = 843372. Its totient is φ = 137760.

The previous prime is 402277. The next prime is 402299. The reversal of 402290 is 92204.

It can be written as a sum of positive squares in 2 ways, for example, as 388129 + 14161 = 623^2 + 119^2 .

It is a Curzon number.

It is a plaindrome in base 13.

It is a zygodrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (402299) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 80 + ... + 900.

2⁴⁰²²⁹⁰ is an apocalyptic number.

402290 is an abundant number, since it is smaller than the sum of its proper divisors (441082).

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

402290 is a wasteful number, since it uses less digits than its factorization.

402290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 842 (or 835 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 402290 is about 634.2633522442. The cubic root of 402290 is about 73.8209696998.

Adding to 402290 its reverse (92204), we get a palindrome (494494).

The spelling of 402290 in words is "four hundred two thousand, two hundred ninety".