420531506 has 8 divisors (see below), whose sum is σ = 646182684. Its totient is φ = 205137280.

The previous prime is 420531493. The next prime is 420531539. The reversal of 420531506 is 605135024.

It can be written as a sum of positive squares in 2 ways, for example, as 284225881 + 136305625 = 16859^2 + 11675^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2564135 + ... + 2564298.

Almost surely, 2^420531506 is an apocalyptic number.

420531506 is a deficient number, since it is larger than the sum of its proper divisors (225651178).

420531506 is a wasteful number, since it uses less digits than its factorization.

420531506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5128476.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 420531506 is about 20506.8648505811. The cubic root of 420531506 is about 749.2030087807.

The spelling of 420531506 in words is "four hundred twenty million, five hundred thirty-one thousand, five hundred six".