420440217 has 4 divisors (see below), whose sum is σ = 560586960. Its totient is φ = 280293476.

The previous prime is 420440201. The next prime is 420440221. The reversal of 420440217 is 712044024.

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 not a de Polignac number, because 420440217 - 2⁴ = 420440201 is a prime.

It is not an unprimeable number, because it can be changed into a prime (420445217) 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, 70073367 + ... + 70073372.

It is an arithmetic number, because the mean of its divisors is an integer number (140146740).

Almost surely, 2^420440217 is an apocalyptic number.

It is an amenable number.

420440217 is a deficient number, since it is larger than the sum of its proper divisors (140146743).

420440217 is a wasteful number, since it uses less digits than its factorization.

420440217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140146742.

The product of its (nonzero) digits is 1792, while the sum is 24.

The square root of 420440217 is about 20504.6389141579. The cubic root of 420440217 is about 749.1487925155.

The spelling of 420440217 in words is "four hundred twenty million, four hundred forty thousand, two hundred seventeen".