2140243391 has 32 divisors (see below), whose sum is σ = 2670554880. Its totient is φ = 1686182400.

The previous prime is 2140243387. The next prime is 2140243397. The reversal of 2140243391 is 1933420412.

It is a cyclic number.

It is not a de Polignac number, because 2140243391 - 2² = 2140243387 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2140243397) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 303536 + ... + 310506.

It is an arithmetic number, because the mean of its divisors is an integer number (83454840).

Almost surely, 2^2140243391 is an apocalyptic number.

2140243391 is a deficient number, since it is larger than the sum of its proper divisors (530311489).

2140243391 is a wasteful number, since it uses less digits than its factorization.

2140243391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7127.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 2140243391 is about 46262.7646277219. The cubic root of 2140243391 is about 1288.7075955094.

The spelling of 2140243391 in words is "two billion, one hundred forty million, two hundred forty-three thousand, three hundred ninety-one".