420717647 has 8 divisors (see below), whose sum is σ = 496330752. Its totient is φ = 348982200.

The previous prime is 420717643. The next prime is 420717653. The reversal of 420717647 is 746717024.

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

It is not a de Polignac number, because 420717647 - 2² = 420717643 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 420717647.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420717643) 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, 969179 + ... + 969612.

It is an arithmetic number, because the mean of its divisors is an integer number (62041344).

Almost surely, 2^420717647 is an apocalyptic number.

420717647 is a deficient number, since it is larger than the sum of its proper divisors (75613105).

420717647 is a wasteful number, since it uses less digits than its factorization.

420717647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1938829.

The product of its (nonzero) digits is 65856, while the sum is 38.

The square root of 420717647 is about 20511.4028530474. The cubic root of 420717647 is about 749.3135330611.

The spelling of 420717647 in words is "four hundred twenty million, seven hundred seventeen thousand, six hundred forty-seven".