420975 has 18 divisors (see below), whose sum is σ = 754416. Its totient is φ = 224400.

The previous prime is 420967. The next prime is 420977. The reversal of 420975 is 579024.

It is not a de Polignac number, because 420975 - 2³ = 420967 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420977) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 711 + ... + 1160.

It is an arithmetic number, because the mean of its divisors is an integer number (41912).

2⁴²⁰⁹⁷⁵ is an apocalyptic number.

420975 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

420975 is a deficient number, since it is larger than the sum of its proper divisors (333441).

420975 is a wasteful number, since it uses less digits than its factorization.

420975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1887 (or 1879 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 420975 is about 648.8258626165. The cubic root of 420975 is about 74.9466286957.

Adding to 420975 its reverse (579024), we get a palindrome (999999).

The spelling of 420975 in words is "four hundred twenty thousand, nine hundred seventy-five".