420515845 has 4 divisors (see below), whose sum is σ = 504619020. Its totient is φ = 336412672.

The previous prime is 420515807. The next prime is 420515857. The reversal of 420515845 is 548515024.

It is a happy number.

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 131583841 + 288932004 = 11471^2 + 16998^2 .

It is a cyclic number.

It is not a de Polignac number, because 420515845 - 2⁷ = 420515717 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 420515845.

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, 42051580 + ... + 42051589.

It is an arithmetic number, because the mean of its divisors is an integer number (126154755).

Almost surely, 2^420515845 is an apocalyptic number.

It is an amenable number.

420515845 is a deficient number, since it is larger than the sum of its proper divisors (84103175).

420515845 is an equidigital number, since it uses as much as digits as its factorization.

420515845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84103174.

The product of its (nonzero) digits is 32000, while the sum is 34.

The square root of 420515845 is about 20506.4829992859. The cubic root of 420515845 is about 749.1937083171.

The spelling of 420515845 in words is "four hundred twenty million, five hundred fifteen thousand, eight hundred forty-five".