1538445868 has 24 divisors (see below), whose sum is σ = 2709201600. Its totient is φ = 764402688.

The previous prime is 1538445823. The next prime is 1538445929. The reversal of 1538445868 is 8685448351.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 550218 + ... + 553006.

It is an arithmetic number, because the mean of its divisors is an integer number (112883400).

Almost surely, 2^1538445868 is an apocalyptic number.

It is an amenable number.

1538445868 is a deficient number, since it is larger than the sum of its proper divisors (1170755732).

1538445868 is a wasteful number, since it uses less digits than its factorization.

1538445868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3609 (or 3607 counting only the distinct ones).

The product of its digits is 3686400, while the sum is 52.

The square root of 1538445868 is about 39223.0272671552. The cubic root of 1538445868 is about 1154.4117537020.

The spelling of 1538445868 in words is "one billion, five hundred thirty-eight million, four hundred forty-five thousand, eight hundred sixty-eight".