402045505 has 4 divisors (see below), whose sum is σ = 482454612. Its totient is φ = 321636400.

The previous prime is 402045499. The next prime is 402045521. The reversal of 402045505 is 505540204.

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 138015504 + 264030001 = 11748^2 + 16249^2 .

It is not a de Polignac number, because 402045505 - 2¹⁹ = 401521217 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 402045505.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40204546 + ... + 40204555.

It is an arithmetic number, because the mean of its divisors is an integer number (120613653).

Almost surely, 2^402045505 is an apocalyptic number.

It is an amenable number.

402045505 is a deficient number, since it is larger than the sum of its proper divisors (80409107).

402045505 is an equidigital number, since it uses as much as digits as its factorization.

402045505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80409106.

The product of its (nonzero) digits is 4000, while the sum is 25.

The square root of 402045505 is about 20051.0724152101. The cubic root of 402045505 is about 738.0601157200.

Adding to 402045505 its reverse (505540204), we get a palindrome (907585709).

The spelling of 402045505 in words is "four hundred two million, forty-five thousand, five hundred five".