420437 has 4 divisors (see below), whose sum is σ = 421740. Its totient is φ = 419136.

The previous prime is 420421. The next prime is 420439. The reversal of 420437 is 734024.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 148996 + 271441 = 386^2 + 521^2 .

It is a cyclic number.

It is not a de Polignac number, because 420437 - 2⁴ = 420421 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420439) 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, 239 + ... + 947.

It is an arithmetic number, because the mean of its divisors is an integer number (105435).

2⁴²⁰⁴³⁷ is an apocalyptic number.

It is an amenable number.

420437 is a deficient number, since it is larger than the sum of its proper divisors (1303).

420437 is an equidigital number, since it uses as much as digits as its factorization.

420437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1302.

The product of its (nonzero) digits is 672, while the sum is 20.

The square root of 420437 is about 648.4111350062. The cubic root of 420437 is about 74.9146881806.

The spelling of 420437 in words is "four hundred twenty thousand, four hundred thirty-seven".