420498891 has 8 divisors (see below), whose sum is σ = 622961360. Its totient is φ = 280332576.

The previous prime is 420498889. The next prime is 420498913. The reversal of 420498891 is 198894024.

It is not a de Polignac number, because 420498891 - 2¹ = 420498889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (420498391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7786990 + ... + 7787043.

It is an arithmetic number, because the mean of its divisors is an integer number (77870170).

Almost surely, 2^420498891 is an apocalyptic number.

420498891 is a deficient number, since it is larger than the sum of its proper divisors (202462469).

420498891 is a wasteful number, since it uses less digits than its factorization.

420498891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15574042 (or 15574036 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 45.

The square root of 420498891 is about 20506.0696136534. The cubic root of 420498891 is about 749.1836397303.

The spelling of 420498891 in words is "four hundred twenty million, four hundred ninety-eight thousand, eight hundred ninety-one".