420440815 has 8 divisors (see below), whose sum is σ = 505985040. Its totient is φ = 335381952.

The previous prime is 420440809. The next prime is 420440827. The reversal of 420440815 is 518044024.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 420440815 - 2⁷ = 420440687 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 119430 + ... + 122899.

It is an arithmetic number, because the mean of its divisors is an integer number (63248130).

Almost surely, 2^420440815 is an apocalyptic number.

420440815 is a deficient number, since it is larger than the sum of its proper divisors (85544225).

420440815 is a wasteful number, since it uses less digits than its factorization.

420440815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242681.

The product of its (nonzero) digits is 5120, while the sum is 28.

The square root of 420440815 is about 20504.6534962189. The cubic root of 420440815 is about 749.1491476914.

Adding to 420440815 its reverse (518044024), we get a palindrome (938484839).

The spelling of 420440815 in words is "four hundred twenty million, four hundred forty thousand, eight hundred fifteen".