421894789 has 4 divisors (see below), whose sum is σ = 422138860. Its totient is φ = 421650720.

The previous prime is 421894769. The next prime is 421894793. The reversal of 421894789 is 987498124.

It is a happy number.

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 62489025 + 359405764 = 7905^2 + 18958^2 .

It is a cyclic number.

It is not a de Polignac number, because 421894789 - 2¹⁹ = 421370501 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 (421894769) 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 3 ways as a sum of consecutive naturals, for example, 119424 + ... + 122905.

It is an arithmetic number, because the mean of its divisors is an integer number (105534715).

Almost surely, 2^421894789 is an apocalyptic number.

It is an amenable number.

421894789 is a deficient number, since it is larger than the sum of its proper divisors (244071).

421894789 is a wasteful number, since it uses less digits than its factorization.

421894789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244070.

The product of its digits is 1161216, while the sum is 52.

The square root of 421894789 is about 20540.0776288699. The cubic root of 421894789 is about 750.0117266315.

The spelling of 421894789 in words is "four hundred twenty-one million, eight hundred ninety-four thousand, seven hundred eighty-nine".