1538933399 has 4 divisors (see below), whose sum is σ = 1539017760. Its totient is φ = 1538849040.

The previous prime is 1538933369. The next prime is 1538933423. The reversal of 1538933399 is 9933398351.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9933398351 = 947 ⋅10489333.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1538933399 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 1538933399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1538933359) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2159 + ... + 55520.

It is an arithmetic number, because the mean of its divisors is an integer number (384754440).

Almost surely, 2^1538933399 is an apocalyptic number.

1538933399 is a deficient number, since it is larger than the sum of its proper divisors (84361).

1538933399 is an equidigital number, since it uses as much as digits as its factorization.

1538933399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84360.

The product of its digits is 2361960, while the sum is 53.

The square root of 1538933399 is about 39229.2416317216. The cubic root of 1538933399 is about 1154.5336845603.

The spelling of 1538933399 in words is "one billion, five hundred thirty-eight million, nine hundred thirty-three thousand, three hundred ninety-nine".