421989293 has 4 divisors (see below), whose sum is σ = 460351968. Its totient is φ = 383626620.

The previous prime is 421989287. The next prime is 421989301. The reversal of 421989293 is 392989124.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 421989293 - 2⁸ = 421989037 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 (421989263) 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, 19181321 + ... + 19181342.

It is an arithmetic number, because the mean of its divisors is an integer number (115087992).

Almost surely, 2^421989293 is an apocalyptic number.

It is an amenable number.

421989293 is a deficient number, since it is larger than the sum of its proper divisors (38362675).

421989293 is a wasteful number, since it uses less digits than its factorization.

421989293 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38362674.

The product of its digits is 279936, while the sum is 47.

The square root of 421989293 is about 20542.3779782186. The cubic root of 421989293 is about 750.0677230698.

The spelling of 421989293 in words is "four hundred twenty-one million, nine hundred eighty-nine thousand, two hundred ninety-three".