4040400191 has 2 divisors, whose sum is σ = 4040400192. Its totient is φ = 4040400190.

The previous prime is 4040400187. The next prime is 4040400223. The reversal of 4040400191 is 1910040404.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 4040400191 - 2² = 4040400187 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4040400121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2020200095 + 2020200096.

It is an arithmetic number, because the mean of its divisors is an integer number (2020200096).

Almost surely, 2^4040400191 is an apocalyptic number.

4040400191 is a deficient number, since it is larger than the sum of its proper divisors (1).

4040400191 is an equidigital number, since it uses as much as digits as its factorization.

4040400191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 4040400191 is about 63564.1423366980. The cubic root of 4040400191 is about 1592.7274352469.

Adding to 4040400191 its reverse (1910040404), we get a palindrome (5950440595).

The spelling of 4040400191 in words is "four billion, forty million, four hundred thousand, one hundred ninety-one".