402520445 has 4 divisors (see below), whose sum is σ = 483024540. Its totient is φ = 322016352.

The previous prime is 402520429. The next prime is 402520457. The reversal of 402520445 is 544025204.

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 289884676 + 112635769 = 17026^2 + 10613^2 .

It is a cyclic number.

It is not a de Polignac number, because 402520445 - 2⁴ = 402520429 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40252040 + ... + 40252049.

It is an arithmetic number, because the mean of its divisors is an integer number (120756135).

Almost surely, 2^402520445 is an apocalyptic number.

It is an amenable number.

402520445 is a deficient number, since it is larger than the sum of its proper divisors (80504095).

402520445 is an equidigital number, since it uses as much as digits as its factorization.

402520445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80504094.

The product of its (nonzero) digits is 6400, while the sum is 26.

The square root of 402520445 is about 20062.9121764514. The cubic root of 402520445 is about 738.3506270574.

Adding to 402520445 its reverse (544025204), we get a palindrome (946545649).

The spelling of 402520445 in words is "four hundred two million, five hundred twenty thousand, four hundred forty-five".