402389 has 6 divisors (see below), whose sum is σ = 435906. Its totient is φ = 371280.

The previous prime is 402383. The next prime is 402403. The reversal of 402389 is 983204.

It can be written as a sum of positive squares in 3 ways, for example, as 54289 + 348100 = 233^2 + 590^2 .

It is not a de Polignac number, because 402389 - 2⁸ = 402133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402383) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1022 + ... + 1359.

It is an arithmetic number, because the mean of its divisors is an integer number (72651).

2⁴⁰²³⁸⁹ is an apocalyptic number.

It is an amenable number.

402389 is a deficient number, since it is larger than the sum of its proper divisors (33517).

402389 is a wasteful number, since it uses less digits than its factorization.

402389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2407 (or 2394 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 402389 is about 634.3413907353. The cubic root of 402389 is about 73.8270247650.

The spelling of 402389 in words is "four hundred two thousand, three hundred eighty-nine".