3806406991 has 2 divisors, whose sum is σ = 3806406992. Its totient is φ = 3806406990.

The previous prime is 3806406983. The next prime is 3806407021. The reversal of 3806406991 is 1996046083.

3806406991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3806406991 - 2³ = 3806406983 is a prime.

It is a super-2 number, since 2×3806406991² = 28977468362267348162, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3806406911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1903203495 + 1903203496.

It is an arithmetic number, because the mean of its divisors is an integer number (1903203496).

Almost surely, 2^3806406991 is an apocalyptic number.

3806406991 is a deficient number, since it is larger than the sum of its proper divisors (1).

3806406991 is an equidigital number, since it uses as much as digits as its factorization.

3806406991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 279936, while the sum is 46.

The square root of 3806406991 is about 61696.0857024171. The cubic root of 3806406991 is about 1561.3672802150.

The spelling of 3806406991 in words is "three billion, eight hundred six million, four hundred six thousand, nine hundred ninety-one".