420402209 has 8 divisors (see below), whose sum is σ = 424955520. Its totient is φ = 415861776.

The previous prime is 420402181. The next prime is 420402223. The reversal of 420402209 is 902204024.

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

It is a cyclic number.

It is not a de Polignac number, because 420402209 - 2²⁸ = 151966753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (420402239) 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, 71624 + ... + 77270.

It is an arithmetic number, because the mean of its divisors is an integer number (53119440).

Almost surely, 2^420402209 is an apocalyptic number.

It is an amenable number.

420402209 is a deficient number, since it is larger than the sum of its proper divisors (4553311).

420402209 is a wasteful number, since it uses less digits than its factorization.

420402209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6439.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 420402209 is about 20503.7120785481. The cubic root of 420402209 is about 749.1262173635.

The spelling of 420402209 in words is "four hundred twenty million, four hundred two thousand, two hundred nine".