420939609 has 8 divisors (see below), whose sum is σ = 561349440. Its totient is φ = 280578096.

The previous prime is 420939581. The next prime is 420939637. The reversal of 420939609 is 906939024.

It is an interprime number because it is at equal distance from previous prime (420939581) and next prime (420939637).

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

It is not a de Polignac number, because 420939609 - 2⁷ = 420939481 is a prime.

It is not an unprimeable number, because it can be changed into a prime (420939109) 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, 21939 + ... + 36375.

It is an arithmetic number, because the mean of its divisors is an integer number (70168680).

Almost surely, 2^420939609 is an apocalyptic number.

It is an amenable number.

420939609 is a deficient number, since it is larger than the sum of its proper divisors (140409831).

420939609 is a wasteful number, since it uses less digits than its factorization.

420939609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24159.

The product of its (nonzero) digits is 104976, while the sum is 42.

The square root of 420939609 is about 20516.8128372806. The cubic root of 420939609 is about 749.4452840436.

The spelling of 420939609 in words is "four hundred twenty million, nine hundred thirty-nine thousand, six hundred nine".