423203989 has 16 divisors (see below), whose sum is σ = 476809200. Its totient is φ = 372911616.

The previous prime is 423203941. The next prime is 423204013. The reversal of 423203989 is 989302324.

It can be written as a sum of positive squares in 8 ways, for example, as 60606225 + 362597764 = 7785^2 + 19042^2 .

It is a cyclic number.

It is not a de Polignac number, because 423203989 - 2¹¹ = 423201941 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 (423203089) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27247 + ... + 39859.

It is an arithmetic number, because the mean of its divisors is an integer number (29800575).

Almost surely, 2^423203989 is an apocalyptic number.

It is an amenable number.

423203989 is a deficient number, since it is larger than the sum of its proper divisors (53605211).

423203989 is a wasteful number, since it uses less digits than its factorization.

423203989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12744.

The product of its (nonzero) digits is 93312, while the sum is 40.

The square root of 423203989 is about 20571.9223457605. The cubic root of 423203989 is about 750.7867235033.

The spelling of 423203989 in words is "four hundred twenty-three million, two hundred three thousand, nine hundred eighty-nine".