1138643212 has 48 divisors (see below), whose sum is σ = 2306920000. Its totient is φ = 481676544.

The previous prime is 1138643203. The next prime is 1138643251. The reversal of 1138643212 is 2123468311.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1064614 + ... + 1065682.

Almost surely, 2^1138643212 is an apocalyptic number.

It is an amenable number.

1138643212 is an abundant number, since it is smaller than the sum of its proper divisors (1168276788).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1138643212 is a wasteful number, since it uses less digits than its factorization.

1138643212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1538 (or 1536 counting only the distinct ones).

The product of its digits is 6912, while the sum is 31.

The square root of 1138643212 is about 33743.7877541926. The cubic root of 1138643212 is about 1044.2293294499.

The spelling of 1138643212 in words is "one billion, one hundred thirty-eight million, six hundred forty-three thousand, two hundred twelve".