402505849 has 4 divisors (see below), whose sum is σ = 402910564. Its totient is φ = 402101136.

The previous prime is 402505801. The next prime is 402505853. The reversal of 402505849 is 948505204.

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 311169600 + 91336249 = 17640^2 + 9557^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-402505849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (402505879) 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, 200862 + ... + 202855.

It is an arithmetic number, because the mean of its divisors is an integer number (100727641).

Almost surely, 2^402505849 is an apocalyptic number.

It is an amenable number.

402505849 is a deficient number, since it is larger than the sum of its proper divisors (404715).

402505849 is an equidigital number, since it uses as much as digits as its factorization.

402505849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404714.

The product of its (nonzero) digits is 57600, while the sum is 37.

The square root of 402505849 is about 20062.5484173871. The cubic root of 402505849 is about 738.3417023795.

It can be divided in two parts, 40 and 2505849, that added together give a square (2505889 = 1583²).

The spelling of 402505849 in words is "four hundred two million, five hundred five thousand, eight hundred forty-nine".