2120405 has 16 divisors (see below), whose sum is σ = 2972160. Its totient is φ = 1421952.

The previous prime is 2120387. The next prime is 2120411. The reversal of 2120405 is 5040212.

It is not a de Polignac number, because 2120405 - 2⁶ = 2120341 is a prime.

It is a super-2 number, since 2×2120405² = 8992234728050, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2120405.

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, 1001 + ... + 2289.

It is an arithmetic number, because the mean of its divisors is an integer number (185760).

2^2120405 is an apocalyptic number.

It is an amenable number.

2120405 is a deficient number, since it is larger than the sum of its proper divisors (851755).

2120405 is a wasteful number, since it uses less digits than its factorization.

2120405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1348.

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 2120405 is about 1456.1610487855. The cubic root of 2120405 is about 128.4713456878.

Adding to 2120405 its reverse (5040212), we get a palindrome (7160617).

The spelling of 2120405 in words is "two million, one hundred twenty thousand, four hundred five".