420438847 has 4 divisors (see below), whose sum is σ = 420814360. Its totient is φ = 420063336.

The previous prime is 420438817. The next prime is 420438853. The reversal of 420438847 is 748834024.

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-420438847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420438817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 186072 + ... + 188317.

It is an arithmetic number, because the mean of its divisors is an integer number (105203590).

Almost surely, 2^420438847 is an apocalyptic number.

420438847 is a deficient number, since it is larger than the sum of its proper divisors (375513).

420438847 is a wasteful number, since it uses less digits than its factorization.

420438847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375512.

The product of its (nonzero) digits is 172032, while the sum is 40.

The square root of 420438847 is about 20504.6055070562. The cubic root of 420438847 is about 749.1479788168.

The spelling of 420438847 in words is "four hundred twenty million, four hundred thirty-eight thousand, eight hundred forty-seven".