2140440391 has 2 divisors, whose sum is σ = 2140440392. Its totient is φ = 2140440390.

The previous prime is 2140440377. The next prime is 2140440433. The reversal of 2140440391 is 1930440412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2140440391 - 2¹⁷ = 2140309319 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2140440361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1070220195 + 1070220196.

It is an arithmetic number, because the mean of its divisors is an integer number (1070220196).

Almost surely, 2^2140440391 is an apocalyptic number.

2140440391 is a deficient number, since it is larger than the sum of its proper divisors (1).

2140440391 is an equidigital number, since it uses as much as digits as its factorization.

2140440391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 2140440391 is about 46264.8937208333. The cubic root of 2140440391 is about 1288.7471342535.

The spelling of 2140440391 in words is "two billion, one hundred forty million, four hundred forty thousand, three hundred ninety-one".