2405421 has 12 divisors (see below), whose sum is σ = 3492060. Its totient is φ = 1595520.

The previous prime is 2405399. The next prime is 2405437. The reversal of 2405421 is 1245042.

2405421 is a `hidden beast` number, since 240 + 5 + 421 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 741321 + 1664100 = 861^2 + 1290^2 .

It is a de Polignac number, because none of the positive numbers 2^k-2405421 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2405394 and 2405403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2405441) 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, 1615 + ... + 2723.

It is an arithmetic number, because the mean of its divisors is an integer number (291005).

2^2405421 is an apocalyptic number.

It is an amenable number.

2405421 is a deficient number, since it is larger than the sum of its proper divisors (1086639).

2405421 is a wasteful number, since it uses less digits than its factorization.

2405421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1356 (or 1353 counting only the distinct ones).

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

The square root of 2405421 is about 1550.9419718352. The cubic root of 2405421 is about 133.9873196585.

The spelling of 2405421 in words is "two million, four hundred five thousand, four hundred twenty-one".