1138974644 has 6 divisors (see below), whose sum is σ = 1993205634. Its totient is φ = 569487320.

The previous prime is 1138974643. The next prime is 1138974647. The reversal of 1138974644 is 4464798311.

It can be written as a sum of positive squares in only one way, i.e., 1087680400 + 51294244 = 32980^2 + 7162^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1138974643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 142371827 + ... + 142371834.

It is an arithmetic number, because the mean of its divisors is an integer number (332200939).

Almost surely, 2^1138974644 is an apocalyptic number.

It is an amenable number.

1138974644 is a deficient number, since it is larger than the sum of its proper divisors (854230990).

1138974644 is a wasteful number, since it uses less digits than its factorization.

1138974644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284743665 (or 284743663 counting only the distinct ones).

The product of its digits is 580608, while the sum is 47.

The square root of 1138974644 is about 33748.6984045311. The cubic root of 1138974644 is about 1044.3306364081.

The spelling of 1138974644 in words is "one billion, one hundred thirty-eight million, nine hundred seventy-four thousand, six hundred forty-four".