402889 has 4 divisors (see below), whose sum is σ = 406980. Its totient is φ = 398800.

The previous prime is 402881. The next prime is 402923. The reversal of 402889 is 988204.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 308025 + 94864 = 555^2 + 308^2 .

It is a cyclic number.

It is not a de Polignac number, because 402889 - 2³ = 402881 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 402889.

It is not an unprimeable number, because it can be changed into a prime (402881) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1894 + ... + 2095.

It is an arithmetic number, because the mean of its divisors is an integer number (101745).

2⁴⁰²⁸⁸⁹ is an apocalyptic number.

It is an amenable number.

402889 is a deficient number, since it is larger than the sum of its proper divisors (4091).

402889 is a wasteful number, since it uses less digits than its factorization.

402889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4090.

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 402889 is about 634.7353779332. The cubic root of 402889 is about 73.8575907378.

The spelling of 402889 in words is "four hundred two thousand, eight hundred eighty-nine".