420800391 has 24 divisors (see below), whose sum is σ = 697981440. Its totient is φ = 241606800.

The previous prime is 420800381. The next prime is 420800437. The reversal of 420800391 is 193008024.

It is not a de Polignac number, because 420800391 - 2⁶ = 420800327 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420800321) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 109975 + ... + 113736.

It is an arithmetic number, because the mean of its divisors is an integer number (29082560).

Almost surely, 2^420800391 is an apocalyptic number.

420800391 is a deficient number, since it is larger than the sum of its proper divisors (277181049).

420800391 is a wasteful number, since it uses less digits than its factorization.

420800391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223747 (or 223744 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 420800391 is about 20513.4197782817. The cubic root of 420800391 is about 749.3626532055.

The spelling of 420800391 in words is "four hundred twenty million, eight hundred thousand, three hundred ninety-one".