420637 has 4 divisors (see below), whose sum is σ = 480736. Its totient is φ = 360540.

The previous prime is 420613. The next prime is 420671. The reversal of 420637 is 736024.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-420637 is a prime.

It is a Duffinian number.

420637 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30039 + ... + 30052.

It is an arithmetic number, because the mean of its divisors is an integer number (120184).

2⁴²⁰⁶³⁷ is an apocalyptic number.

It is an amenable number.

420637 is a deficient number, since it is larger than the sum of its proper divisors (60099).

420637 is an equidigital number, since it uses as much as digits as its factorization.

420637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60098.

The product of its (nonzero) digits is 1008, while the sum is 22.

The square root of 420637 is about 648.5653398078. The cubic root of 420637 is about 74.9265651582.

The spelling of 420637 in words is "four hundred twenty thousand, six hundred thirty-seven".