1238423989 has 12 divisors (see below), whose sum is σ = 1364848128. Its totient is φ = 1122858440.

The previous prime is 1238423981. The next prime is 1238423999. The reversal of 1238423989 is 9893248321.

It is not a de Polignac number, because 1238423989 - 2³ = 1238423981 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 (1238423981) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32982 + ... + 59704.

It is an arithmetic number, because the mean of its divisors is an integer number (113737344).

Almost surely, 2^1238423989 is an apocalyptic number.

It is an amenable number.

1238423989 is a deficient number, since it is larger than the sum of its proper divisors (126424139).

1238423989 is a wasteful number, since it uses less digits than its factorization.

1238423989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27128 (or 27117 counting only the distinct ones).

The product of its digits is 746496, while the sum is 49.

The square root of 1238423989 is about 35191.2487559052. The cubic root of 1238423989 is about 1073.8817255928.

The spelling of 1238423989 in words is "one billion, two hundred thirty-eight million, four hundred twenty-three thousand, nine hundred eighty-nine".