1138389636 has 24 divisors (see below), whose sum is σ = 2796045280. Its totient is φ = 359491392.

The previous prime is 1138389631. The next prime is 1138389643. The reversal of 1138389636 is 6369838311.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1138389631) 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, 2496241 + ... + 2496696.

Almost surely, 2^1138389636 is an apocalyptic number.

It is an amenable number.

1138389636 is an abundant number, since it is smaller than the sum of its proper divisors (1657655644).

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

1138389636 is a wasteful number, since it uses less digits than its factorization.

1138389636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4992963 (or 4992961 counting only the distinct ones).

The product of its digits is 559872, while the sum is 48.

The square root of 1138389636 is about 33740.0301718893. The cubic root of 1138389636 is about 1044.1518070230.

The spelling of 1138389636 in words is "one billion, one hundred thirty-eight million, three hundred eighty-nine thousand, six hundred thirty-six".