2140405 has 16 divisors (see below), whose sum is σ = 2694384. Its totient is φ = 1630720.

The previous prime is 2140399. The next prime is 2140421. The reversal of 2140405 is 5040412.

It can be written as a sum of positive squares in 8 ways, for example, as 14641 + 2125764 = 121^2 + 1458^2 .

It is not a de Polignac number, because 2140405 - 2¹³ = 2132213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10767 + ... + 10963.

It is an arithmetic number, because the mean of its divisors is an integer number (168399).

2^2140405 is an apocalyptic number.

It is an amenable number.

2140405 is a deficient number, since it is larger than the sum of its proper divisors (553979).

2140405 is a wasteful number, since it uses less digits than its factorization.

2140405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296.

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 2140405 is about 1463.0123034343. The cubic root of 2140405 is about 128.8740031307.

Adding to 2140405 its reverse (5040412), we get a palindrome (7180817).

The spelling of 2140405 in words is "two million, one hundred forty thousand, four hundred five".