420405051 has 32 divisors (see below), whose sum is σ = 619718400. Its totient is φ = 251395200.

The previous prime is 420405047. The next prime is 420405061. The reversal of 420405051 is 150504024.

It is not a de Polignac number, because 420405051 - 2² = 420405047 is a prime.

It is not an unprimeable number, because it can be changed into a prime (420405061) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1204425 + ... + 1204773.

It is an arithmetic number, because the mean of its divisors is an integer number (19366200).

Almost surely, 2^420405051 is an apocalyptic number.

420405051 is a deficient number, since it is larger than the sum of its proper divisors (199313349).

420405051 is a wasteful number, since it uses less digits than its factorization.

420405051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 747.

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 420405051 is about 20503.7813829547. The cubic root of 420405051 is about 749.1279054389.

Adding to 420405051 its reverse (150504024), we get a palindrome (570909075).

The spelling of 420405051 in words is "four hundred twenty million, four hundred five thousand, fifty-one".