402845 has 16 divisors (see below), whose sum is σ = 525312. Its totient is φ = 295680.

The previous prime is 402823. The next prime is 402847. The reversal of 402845 is 548204.

It is a de Polignac number, because none of the positive numbers 2^k-402845 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

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 402845.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402847) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3509 + ... + 3621.

It is an arithmetic number, because the mean of its divisors is an integer number (32832).

2⁴⁰²⁸⁴⁵ is an apocalyptic number.

It is an amenable number.

402845 is a deficient number, since it is larger than the sum of its proper divisors (122467).

402845 is a wasteful number, since it uses less digits than its factorization.

402845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172.

The product of its (nonzero) digits is 1280, while the sum is 23.

The square root of 402845 is about 634.7007168737. The cubic root of 402845 is about 73.8549019473.

The spelling of 402845 in words is "four hundred two thousand, eight hundred forty-five".