420915 has 16 divisors (see below), whose sum is σ = 734976. Its totient is φ = 204000.

The previous prime is 420899. The next prime is 420919. The reversal of 420915 is 519024.

It is not a de Polignac number, because 420915 - 2⁴ = 420899 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 420891 and 420900.

It is not an unprimeable number, because it can be changed into a prime (420919) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1111 + ... + 1440.

It is an arithmetic number, because the mean of its divisors is an integer number (45936).

2⁴²⁰⁹¹⁵ is an apocalyptic number.

420915 is a deficient number, since it is larger than the sum of its proper divisors (314061).

420915 is a wasteful number, since it uses less digits than its factorization.

420915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2570.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 420915 is about 648.7796236011. The cubic root of 420915 is about 74.9430679052.

Adding to 420915 its reverse (519024), we get a palindrome (939939).

It can be divided in two parts, 4209 and 15, that added together give a palindrome (4224).

The spelling of 420915 in words is "four hundred twenty thousand, nine hundred fifteen".