420407491 has 8 divisors (see below), whose sum is σ = 480591200. Its totient is φ = 360255168.

The previous prime is 420407489. The next prime is 420407497. The reversal of 420407491 is 194704024.

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

It is not a de Polignac number, because 420407491 - 2¹ = 420407489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (420407497) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41935 + ... + 50983.

It is an arithmetic number, because the mean of its divisors is an integer number (60073900).

Almost surely, 2^420407491 is an apocalyptic number.

420407491 is a deficient number, since it is larger than the sum of its proper divisors (60183709).

420407491 is an equidigital number, since it uses as much as digits as its factorization.

420407491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15693.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 420407491 is about 20503.8408840880. The cubic root of 420407491 is about 749.1293547305.

The spelling of 420407491 in words is "four hundred twenty million, four hundred seven thousand, four hundred ninety-one".