420547 has 4 divisors (see below), whose sum is σ = 422920. Its totient is φ = 418176.

The previous prime is 420521. The next prime is 420551. The reversal of 420547 is 745024.

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 420547 - 2⁷ = 420419 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (420557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 897 + ... + 1282.

It is an arithmetic number, because the mean of its divisors is an integer number (105730).

2⁴²⁰⁵⁴⁷ is an apocalyptic number.

420547 is a deficient number, since it is larger than the sum of its proper divisors (2373).

420547 is a wasteful number, since it uses less digits than its factorization.

420547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2372.

The product of its (nonzero) digits is 1120, while the sum is 22.

The square root of 420547 is about 648.4959521847. The cubic root of 420547 is about 74.9212209842.

The spelling of 420547 in words is "four hundred twenty thousand, five hundred forty-seven".