402145 has 4 divisors (see below), whose sum is σ = 482580. Its totient is φ = 321712.

The previous prime is 402139. The next prime is 402197. The reversal of 402145 is 541204.

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 80656 + 321489 = 284^2 + 567^2 .

It is a cyclic number.

It is not a de Polignac number, because 402145 - 2³ = 402137 is a prime.

402145 is a lucky number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40210 + ... + 40219.

It is an arithmetic number, because the mean of its divisors is an integer number (120645).

2⁴⁰²¹⁴⁵ is an apocalyptic number.

It is an amenable number.

402145 is a deficient number, since it is larger than the sum of its proper divisors (80435).

402145 is an equidigital number, since it uses as much as digits as its factorization.

402145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80434.

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 402145 is about 634.1490361106. The cubic root of 402145 is about 73.8120993766.

Adding to 402145 its reverse (541204), we get a palindrome (943349).

The spelling of 402145 in words is "four hundred two thousand, one hundred forty-five".