420989897 has 12 divisors (see below), whose sum is σ = 459646020. Its totient is φ = 385070112.

The previous prime is 420989893. The next prime is 420989911. The reversal of 420989897 is 798989024.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 203604361 + 217385536 = 14269^2 + 14744^2 .

It is not a de Polignac number, because 420989897 - 2² = 420989893 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (420989893) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9638 + ... + 30575.

It is an arithmetic number, because the mean of its divisors is an integer number (38303835).

Almost surely, 2^420989897 is an apocalyptic number.

It is an amenable number.

420989897 is a deficient number, since it is larger than the sum of its proper divisors (38656123).

420989897 is a wasteful number, since it uses less digits than its factorization.

420989897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40280 (or 40261 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 56.

The square root of 420989897 is about 20518.0383321603. The cubic root of 420989897 is about 749.4751272824.

The spelling of 420989897 in words is "four hundred twenty million, nine hundred eighty-nine thousand, eight hundred ninety-seven".