400420015 has 4 divisors (see below), whose sum is σ = 480504024. Its totient is φ = 320336008.

The previous prime is 400419997. The next prime is 400420051. The reversal of 400420015 is 510024004.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 400420015 - 2⁵ = 400419983 is a prime.

It is a Duffinian number.

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, 40041997 + ... + 40042006.

It is an arithmetic number, because the mean of its divisors is an integer number (120126006).

Almost surely, 2^400420015 is an apocalyptic number.

400420015 is a deficient number, since it is larger than the sum of its proper divisors (80084009).

400420015 is an equidigital number, since it uses as much as digits as its factorization.

400420015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80084008.

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 400420015 is about 20010.4976199994. The cubic root of 400420015 is about 737.0641009305.

Adding to 400420015 its reverse (510024004), we get a palindrome (910444019).

The spelling of 400420015 in words is "four hundred million, four hundred twenty thousand, fifteen".