1231823644 has 12 divisors (see below), whose sum is σ = 2160121264. Its totient is φ = 614646144.

The previous prime is 1231823641. The next prime is 1231823669. The reversal of 1231823644 is 4463281321.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231823641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 314229 + ... + 318124.

Almost surely, 2^1231823644 is an apocalyptic number.

It is an amenable number.

1231823644 is a deficient number, since it is larger than the sum of its proper divisors (928297620).

1231823644 is a wasteful number, since it uses less digits than its factorization.

1231823644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 632844 (or 632842 counting only the distinct ones).

The product of its digits is 27648, while the sum is 34.

The square root of 1231823644 is about 35097.3452557312. The cubic root of 1231823644 is about 1071.9705278431.

The spelling of 1231823644 in words is "one billion, two hundred thirty-one million, eight hundred twenty-three thousand, six hundred forty-four".