421789617 has 24 divisors (see below), whose sum is σ = 637123968. Its totient is φ = 268382400.

The previous prime is 421789583. The next prime is 421789619. The reversal of 421789617 is 716987124.

It is a happy number.

421789617 is a `hidden beast` number, since 4 + 21 + 7 + 8 + 9 + 617 = 666.

It is not a de Polignac number, because 421789617 - 2⁶ = 421789553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (421789619) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 105892 + ... + 109802.

It is an arithmetic number, because the mean of its divisors is an integer number (26546832).

Almost surely, 2^421789617 is an apocalyptic number.

It is an amenable number.

421789617 is a deficient number, since it is larger than the sum of its proper divisors (215334351).

421789617 is a wasteful number, since it uses less digits than its factorization.

421789617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4461 (or 4458 counting only the distinct ones).

The product of its digits is 169344, while the sum is 45.

The square root of 421789617 is about 20537.5173037054. The cubic root of 421789617 is about 749.9493992528.

The spelling of 421789617 in words is "four hundred twenty-one million, seven hundred eighty-nine thousand, six hundred seventeen".