1538489899 has 4 divisors (see below), whose sum is σ = 1539971680. Its totient is φ = 1537008120.

The previous prime is 1538489891. The next prime is 1538489921. The reversal of 1538489899 is 9989848351.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9989848351 = 7 ⋅1427121193.

It is a cyclic number.

It is not a de Polignac number, because 1538489899 - 2³ = 1538489891 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1538489899.

It is not an unprimeable number, because it can be changed into a prime (1538489891) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 739332 + ... + 741409.

It is an arithmetic number, because the mean of its divisors is an integer number (384992920).

Almost surely, 2^1538489899 is an apocalyptic number.

1538489899 is a deficient number, since it is larger than the sum of its proper divisors (1481781).

1538489899 is a wasteful number, since it uses less digits than its factorization.

1538489899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1481780.

The product of its digits is 22394880, while the sum is 64.

The square root of 1538489899 is about 39223.5885533183. The cubic root of 1538489899 is about 1154.4227668549.

The spelling of 1538489899 in words is "one billion, five hundred thirty-eight million, four hundred eighty-nine thousand, eight hundred ninety-nine".