2142391 has 4 divisors (see below), whose sum is σ = 2268432. Its totient is φ = 2016352.

The previous prime is 2142377. The next prime is 2142397. The reversal of 2142391 is 1932412.

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 2142391 - 2⁹ = 2141879 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a plaindrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2142397) 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, 62995 + ... + 63028.

It is an arithmetic number, because the mean of its divisors is an integer number (567108).

2^2142391 is an apocalyptic number.

2142391 is a deficient number, since it is larger than the sum of its proper divisors (126041).

2142391 is a wasteful number, since it uses less digits than its factorization.

2142391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126040.

The product of its digits is 432, while the sum is 22.

The square root of 2142391 is about 1463.6908826661. The cubic root of 2142391 is about 128.9138498966.

The spelling of 2142391 in words is "two million, one hundred forty-two thousand, three hundred ninety-one".