421986239 has 4 divisors (see below), whose sum is σ = 425207640. Its totient is φ = 418764840.

The previous prime is 421986179. The next prime is 421986241. The reversal of 421986239 is 932689124.

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

It is a cyclic number.

It is not a de Polignac number, because 421986239 - 2²⁴ = 405209023 is a prime.

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 421986239.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421988239) 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, 1610504 + ... + 1610765.

It is an arithmetic number, because the mean of its divisors is an integer number (106301910).

Almost surely, 2^421986239 is an apocalyptic number.

421986239 is a deficient number, since it is larger than the sum of its proper divisors (3221401).

421986239 is a wasteful number, since it uses less digits than its factorization.

421986239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3221400.

The product of its digits is 186624, while the sum is 44.

The square root of 421986239 is about 20542.3036439441. The cubic root of 421986239 is about 750.0659136144.

The spelling of 421986239 in words is "four hundred twenty-one million, nine hundred eighty-six thousand, two hundred thirty-nine".