1538444216 has 16 divisors (see below), whose sum is σ = 2905337400. Its totient is φ = 763687584.

The previous prime is 1538444207. The next prime is 1538444227. The reversal of 1538444216 is 6124448351.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1538444216.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 690635 + ... + 692858.

Almost surely, 2^1538444216 is an apocalyptic number.

It is an amenable number.

1538444216 is a deficient number, since it is larger than the sum of its proper divisors (1366893184).

1538444216 is a wasteful number, since it uses less digits than its factorization.

1538444216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1383638 (or 1383634 counting only the distinct ones).

The product of its digits is 92160, while the sum is 38.

The square root of 1538444216 is about 39223.0062080917. The cubic root of 1538444216 is about 1154.4113404952.

The spelling of 1538444216 in words is "one billion, five hundred thirty-eight million, four hundred forty-four thousand, two hundred sixteen".