1215230644 has 6 divisors (see below), whose sum is σ = 2126653634. Its totient is φ = 607615320.

The previous prime is 1215230629. The next prime is 1215230683. The reversal of 1215230644 is 4460325121.

It can be written as a sum of positive squares in only one way, i.e., 1144468900 + 70761744 = 33830^2 + 8412^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 151903827 + ... + 151903834.

Almost surely, 2^1215230644 is an apocalyptic number.

It is an amenable number.

1215230644 is a deficient number, since it is larger than the sum of its proper divisors (911422990).

1215230644 is a wasteful number, since it uses less digits than its factorization.

1215230644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303807665 (or 303807663 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 1215230644 is about 34860.1584046889. The cubic root of 1215230644 is about 1067.1355077416.

Adding to 1215230644 its reverse (4460325121), we get a palindrome (5675555765).

The spelling of 1215230644 in words is "one billion, two hundred fifteen million, two hundred thirty thousand, six hundred forty-four".