2406021 has 4 divisors (see below), whose sum is σ = 3208032. Its totient is φ = 1604012.

The previous prime is 2405987. The next prime is 2406029. The reversal of 2406021 is 1206042.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2406021 - 2⁹ = 2405509 is a prime.

It is a D-number.

It is a Curzon number.

2406021 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2406029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 401001 + ... + 401006.

It is an arithmetic number, because the mean of its divisors is an integer number (802008).

2^2406021 is an apocalyptic number.

It is an amenable number.

2406021 is a deficient number, since it is larger than the sum of its proper divisors (802011).

2406021 is an equidigital number, since it uses as much as digits as its factorization.

2406021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 802010.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 2406021 is about 1551.1353906091. The cubic root of 2406021 is about 133.9984591788.

The spelling of 2406021 in words is "two million, four hundred six thousand, twenty-one".