3991389107 has 2 divisors, whose sum is σ = 3991389108. Its totient is φ = 3991389106.

The previous prime is 3991389079. The next prime is 3991389197. The reversal of 3991389107 is 7019831993.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3991389107 - 2²² = 3987194803 is a prime.

It is not a weakly prime, because it can be changed into another prime (3991389197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1995694553 + 1995694554.

It is an arithmetic number, because the mean of its divisors is an integer number (1995694554).

Almost surely, 2^3991389107 is an apocalyptic number.

3991389107 is a deficient number, since it is larger than the sum of its proper divisors (1).

3991389107 is an equidigital number, since it uses as much as digits as its factorization.

3991389107 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 367416, while the sum is 50.

The square root of 3991389107 is about 63177.4414407548. The cubic root of 3991389107 is about 1586.2611552319.

The spelling of 3991389107 in words is "three billion, nine hundred ninety-one million, three hundred eighty-nine thousand, one hundred seven".