402143605 has 4 divisors (see below), whose sum is σ = 482572332. Its totient is φ = 321714880.

The previous prime is 402143597. The next prime is 402143629. The reversal of 402143605 is 506341204.

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 261436561 + 140707044 = 16169^2 + 11862^2 .

It is not a de Polignac number, because 402143605 - 2³ = 402143597 is a prime.

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 402143605.

It is a congruent 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, 40214356 + ... + 40214365.

It is an arithmetic number, because the mean of its divisors is an integer number (120643083).

Almost surely, 2^402143605 is an apocalyptic number.

It is an amenable number.

402143605 is a deficient number, since it is larger than the sum of its proper divisors (80428727).

402143605 is an equidigital number, since it uses as much as digits as its factorization.

402143605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80428726.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 402143605 is about 20053.5185192026. The cubic root of 402143605 is about 738.1201402764.

Adding to 402143605 its reverse (506341204), we get a palindrome (908484809).

The spelling of 402143605 in words is "four hundred two million, one hundred forty-three thousand, six hundred five".