2406421 has 6 divisors (see below), whose sum is σ = 2516150. Its totient is φ = 2301288.

The previous prime is 2406379. The next prime is 2406457. The reversal of 2406421 is 1246042.

It can be written as a sum of positive squares in only one way, i.e., 2235025 + 171396 = 1495^2 + 414^2 .

It is not a de Polignac number, because 2406421 - 2¹⁷ = 2275349 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2406461) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1746 + ... + 2803.

2^2406421 is an apocalyptic number.

It is an amenable number.

2406421 is a deficient number, since it is larger than the sum of its proper divisors (109729).

2406421 is an equidigital number, since it uses as much as digits as its factorization.

2406421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4595 (or 4572 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 2406421 is about 1551.2643230604. The cubic root of 2406421 is about 134.0058844969.

The spelling of 2406421 in words is "two million, four hundred six thousand, four hundred twenty-one".