1990077899 has 4 divisors (see below), whose sum is σ = 2010594264. Its totient is φ = 1969561536.

The previous prime is 1990077889. The next prime is 1990077937. The reversal of 1990077899 is 9987700991.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1990077899 - 2¹² = 1990073803 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1990077839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10258037 + ... + 10258230.

It is an arithmetic number, because the mean of its divisors is an integer number (502648566).

Almost surely, 2^1990077899 is an apocalyptic number.

1990077899 is a deficient number, since it is larger than the sum of its proper divisors (20516365).

1990077899 is an equidigital number, since it uses as much as digits as its factorization.

1990077899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20516364.

The product of its (nonzero) digits is 2571912, while the sum is 59.

The square root of 1990077899 is about 44610.2891606858. The cubic root of 1990077899 is about 1257.8340842485.

The spelling of 1990077899 in words is "one billion, nine hundred ninety million, seventy-seven thousand, eight hundred ninety-nine".