3898778999 has 2 divisors, whose sum is σ = 3898779000. Its totient is φ = 3898778998.

The previous prime is 3898778957. The next prime is 3898779023. The reversal of 3898778999 is 9998778983.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3898778999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3898798999) 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, 1949389499 + 1949389500.

It is an arithmetic number, because the mean of its divisors is an integer number (1949389500).

Almost surely, 2^3898778999 is an apocalyptic number.

3898778999 is a deficient number, since it is larger than the sum of its proper divisors (1).

3898778999 is an equidigital number, since it uses as much as digits as its factorization.

3898778999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 493807104, while the sum is 77.

The square root of 3898778999 is about 62440.2033869205. The cubic root of 3898778999 is about 1573.8966319683.

The spelling of 3898778999 in words is "three billion, eight hundred ninety-eight million, seven hundred seventy-eight thousand, nine hundred ninety-nine".