2140381 has 4 divisors (see below), whose sum is σ = 2154172. Its totient is φ = 2126592.

The previous prime is 2140367. The next prime is 2140387. The reversal of 2140381 is 1830412.

2140381 = 1034² + 1035².

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

It can be written as a sum of positive squares in 2 ways, for example, as 1069156 + 1071225 = 1034^2 + 1035^2 .

It is a cyclic number.

It is not a de Polignac number, because 2140381 - 2⁵ = 2140349 is a prime.

It is a super-2 number, since 2×2140381² = 9162461650322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2140387) 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, 6660 + ... + 6973.

It is an arithmetic number, because the mean of its divisors is an integer number (538543).

2^2140381 is an apocalyptic number.

2140381 is the 1035-th centered square number.

It is an amenable number.

2140381 is a deficient number, since it is larger than the sum of its proper divisors (13791).

2140381 is a wasteful number, since it uses less digits than its factorization.

2140381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13790.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 2140381 is about 1463.0041011562. The cubic root of 2140381 is about 128.8735214481.

Adding to 2140381 its reverse (1830412), we get a palindrome (3970793).

The spelling of 2140381 in words is "two million, one hundred forty thousand, three hundred eighty-one".