2142405 has 12 divisors (see below), whose sum is σ = 3713580. Its totient is φ = 1142592.

The previous prime is 2142403. The next prime is 2142431. The reversal of 2142405 is 5042412.

It can be written as a sum of positive squares in 2 ways, for example, as 956484 + 1185921 = 978^2 + 1089^2 .

It is not a de Polignac number, because 2142405 - 2¹ = 2142403 is a prime.

It is an Ulam number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2142403) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23760 + ... + 23849.

It is an arithmetic number, because the mean of its divisors is an integer number (309465).

2^2142405 is an apocalyptic number.

It is an amenable number.

2142405 is a deficient number, since it is larger than the sum of its proper divisors (1571175).

2142405 is a wasteful number, since it uses less digits than its factorization.

2142405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47620 (or 47617 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 2142405 is about 1463.6956650889. The cubic root of 2142405 is about 128.9141307028.

Adding to 2142405 its reverse (5042412), we get a palindrome (7184817).

The spelling of 2142405 in words is "two million, one hundred forty-two thousand, four hundred five".