402489 has 10 divisors (see below), whose sum is σ = 601370. Its totient is φ = 268272.

The previous prime is 402487. The next prime is 402503. The reversal of 402489 is 984204.

It can be written as a sum of positive squares in only one way, i.e., 291600 + 110889 = 540^2 + 333^2 .

It is not a de Polignac number, because 402489 - 2¹ = 402487 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (402487) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 2404 + ... + 2565.

It is an arithmetic number, because the mean of its divisors is an integer number (60137).

2⁴⁰²⁴⁸⁹ is an apocalyptic number.

It is an amenable number.

402489 is a deficient number, since it is larger than the sum of its proper divisors (198881).

402489 is an equidigital number, since it uses as much as digits as its factorization.

402489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4981 (or 4972 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 402489 is about 634.4202077488. The cubic root of 402489 is about 73.8331399844.

The spelling of 402489 in words is "four hundred two thousand, four hundred eighty-nine".