1231457389 has 8 divisors (see below), whose sum is σ = 1255174200. Its totient is φ = 1207965696.

The previous prime is 1231457377. The next prime is 1231457399. The reversal of 1231457389 is 9837541321.

It can be written as a sum of positive squares in 4 ways, for example, as 42380100 + 1189077289 = 6510^2 + 34483^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1231457389 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 (1231457309) 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, 45214 + ... + 67135.

It is an arithmetic number, because the mean of its divisors is an integer number (156896775).

Almost surely, 2^1231457389 is an apocalyptic number.

It is an amenable number.

1231457389 is a deficient number, since it is larger than the sum of its proper divisors (23716811).

1231457389 is a wasteful number, since it uses less digits than its factorization.

1231457389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112559.

The product of its digits is 181440, while the sum is 43.

The square root of 1231457389 is about 35092.1271655054. The cubic root of 1231457389 is about 1071.8642752190.

The spelling of 1231457389 in words is "one billion, two hundred thirty-one million, four hundred fifty-seven thousand, three hundred eighty-nine".