421987309 has 8 divisors (see below), whose sum is σ = 426828960. Its totient is φ = 417173616.

The previous prime is 421987301. The next prime is 421987399. The reversal of 421987309 is 903789124.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 421987309 - 2³ = 421987301 is a prime.

It is a super-2 number, since 2×421987309² = 356146577914122962, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421987301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24154 + ... + 37780.

It is an arithmetic number, because the mean of its divisors is an integer number (53353620).

Almost surely, 2^421987309 is an apocalyptic number.

It is an amenable number.

421987309 is a deficient number, since it is larger than the sum of its proper divisors (4841651).

421987309 is a wasteful number, since it uses less digits than its factorization.

421987309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13979.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 421987309 is about 20542.3296877448. The cubic root of 421987309 is about 750.0665475765.

The spelling of 421987309 in words is "four hundred twenty-one million, nine hundred eighty-seven thousand, three hundred nine".