1938696899 has 4 divisors (see below), whose sum is σ = 1939468440. Its totient is φ = 1937925360.

The previous prime is 1938696889. The next prime is 1938696917. The reversal of 1938696899 is 9986968391.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1938696899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1938696869) 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, 381989 + ... + 387030.

It is an arithmetic number, because the mean of its divisors is an integer number (484867110).

Almost surely, 2^1938696899 is an apocalyptic number.

1938696899 is a deficient number, since it is larger than the sum of its proper divisors (771541).

1938696899 is an equidigital number, since it uses as much as digits as its factorization.

1938696899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 771540.

The product of its digits is 45349632, while the sum is 68.

The square root of 1938696899 is about 44030.6359140996. The cubic root of 1938696899 is about 1246.9143946188.

The spelling of 1938696899 in words is "one billion, nine hundred thirty-eight million, six hundred ninety-six thousand, eight hundred ninety-nine".