402089 has 2 divisors, whose sum is σ = 402090. Its totient is φ = 402088.

The previous prime is 402071. The next prime is 402091. The reversal of 402089 is 980204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 384400 + 17689 = 620^2 + 133^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-402089 is a prime.

It is a Sophie Germain prime.

Together with 402091, it forms a pair of twin primes.

It is a Chen prime.

It is an Ulam number.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201044 + 201045.

It is an arithmetic number, because the mean of its divisors is an integer number (201045).

2⁴⁰²⁰⁸⁹ is an apocalyptic number.

It is an amenable number.

402089 is a deficient number, since it is larger than the sum of its proper divisors (1).

402089 is an equidigital number, since it uses as much as digits as its factorization.

402089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 402089 is about 634.1048809148. The cubic root of 402089 is about 73.8086730259.

The spelling of 402089 in words is "four hundred two thousand, eighty-nine".