1939478899 has 2 divisors, whose sum is σ = 1939478900. Its totient is φ = 1939478898.

The previous prime is 1939478869. The next prime is 1939478909. The reversal of 1939478899 is 9988749391.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1939478899 - 2⁵ = 1939478867 is a prime.

It is not a weakly prime, because it can be changed into another prime (1939478869) 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 as a sum of consecutive naturals, namely, 969739449 + 969739450.

It is an arithmetic number, because the mean of its divisors is an integer number (969739450).

Almost surely, 2^1939478899 is an apocalyptic number.

1939478899 is a deficient number, since it is larger than the sum of its proper divisors (1).

1939478899 is an equidigital number, since it uses as much as digits as its factorization.

1939478899 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 35271936, while the sum is 67.

The square root of 1939478899 is about 44039.5151994206. The cubic root of 1939478899 is about 1247.0820254265.

The spelling of 1939478899 in words is "one billion, nine hundred thirty-nine million, four hundred seventy-eight thousand, eight hundred ninety-nine".