421356789 has 32 divisors (see below), whose sum is σ = 718659840. Its totient is φ = 239003136.

The previous prime is 421356779. The next prime is 421356791. The reversal of 421356789 is 987653124.

421356789 is a `hidden beast` number, since 4 + 2 + 1 + 3 + 567 + 89 = 666.

It is not a de Polignac number, because 421356789 - 2⁹ = 421356277 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421356709) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17757 + ... + 34029.

It is an arithmetic number, because the mean of its divisors is an integer number (22458120).

Almost surely, 2^421356789 is an apocalyptic number.

It is an amenable number.

421356789 is a deficient number, since it is larger than the sum of its proper divisors (297303051).

421356789 is a wasteful number, since it uses less digits than its factorization.

421356789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16426 (or 16420 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 421356789 is about 20526.9771033146. The cubic root of 421356789 is about 749.6927861767.

The spelling of 421356789 in words is "four hundred twenty-one million, three hundred fifty-six thousand, seven hundred eighty-nine".