420789869 has 4 divisors (see below), whose sum is σ = 422309244. Its totient is φ = 419270496.

The previous prime is 420789769. The next prime is 420789881. The reversal of 420789869 is 968987024.

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

It can be written as a sum of positive squares in 2 ways, for example, as 36120100 + 384669769 = 6010^2 + 19613^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-420789869 is a prime.

It is a super-2 number, since 2×420789869² = 354128227706074322, which contains 22 as substring.

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 420789869.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420789269) 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, 759272 + ... + 759825.

It is an arithmetic number, because the mean of its divisors is an integer number (105577311).

Almost surely, 2^420789869 is an apocalyptic number.

It is an amenable number.

420789869 is a deficient number, since it is larger than the sum of its proper divisors (1519375).

420789869 is a wasteful number, since it uses less digits than its factorization.

420789869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1519374.

The product of its (nonzero) digits is 1741824, while the sum is 53.

The square root of 420789869 is about 20513.1633104209. The cubic root of 420789869 is about 749.3564072833.

The spelling of 420789869 in words is "four hundred twenty million, seven hundred eighty-nine thousand, eight hundred sixty-nine".