2140391 has 4 divisors (see below), whose sum is σ = 2334984. Its totient is φ = 1945800.

The previous prime is 2140387. The next prime is 2140393. The reversal of 2140391 is 1930412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2140391 - 2² = 2140387 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2140393) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97280 + ... + 97301.

It is an arithmetic number, because the mean of its divisors is an integer number (583746).

2^2140391 is an apocalyptic number.

2140391 is a deficient number, since it is larger than the sum of its proper divisors (194593).

2140391 is a wasteful number, since it uses less digits than its factorization.

2140391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194592.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 2140391 is about 1463.0075187777. The cubic root of 2140391 is about 128.8737221496.

The spelling of 2140391 in words is "two million, one hundred forty thousand, three hundred ninety-one".