40040200391 has 2 divisors, whose sum is σ = 40040200392. Its totient is φ = 40040200390.

The previous prime is 40040200367. The next prime is 40040200451. The reversal of 40040200391 is 19300204004.

40040200391 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 40040200391 - 2²⁶ = 39973091527 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40040200891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20020100195 + 20020100196.

It is an arithmetic number, because the mean of its divisors is an integer number (20020100196).

Almost surely, 2^40040200391 is an apocalyptic number.

40040200391 is a deficient number, since it is larger than the sum of its proper divisors (1).

40040200391 is an equidigital number, since it uses as much as digits as its factorization.

40040200391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 40040200391 its reverse (19300204004), we get a palindrome (59340404395).

The spelling of 40040200391 in words is "forty billion, forty million, two hundred thousand, three hundred ninety-one".