420217382947 has 4 divisors (see below), whose sum is σ = 420265105776. Its totient is φ = 420169660120.

The previous prime is 420217382933. The next prime is 420217382969. The reversal of 420217382947 is 749283712024.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-420217382947 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 420217382947.

It is not an unprimeable number, because it can be changed into a prime (420217382917) 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, 23848204 + ... + 23865817.

It is an arithmetic number, because the mean of its divisors is an integer number (105066276444).

Almost surely, 2^420217382947 is an apocalyptic number.

420217382947 is a deficient number, since it is larger than the sum of its proper divisors (47722829).

420217382947 is an equidigital number, since it uses as much as digits as its factorization.

420217382947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47722828.

The product of its (nonzero) digits is 1354752, while the sum is 49.

The spelling of 420217382947 in words is "four hundred twenty billion, two hundred seventeen million, three hundred eighty-two thousand, nine hundred forty-seven".