2021406 has 8 divisors (see below), whose sum is σ = 4042824. Its totient is φ = 673800.

The previous prime is 2021381. The next prime is 2021431. The reversal of 2021406 is 6041202.

It is an interprime number because it is at equal distance from previous prime (2021381) and next prime (2021431).

It is a sphenic number, since it is the product of 3 distinct primes.

2021406 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 168445 + ... + 168456.

It is an arithmetic number, because the mean of its divisors is an integer number (505353).

2^2021406 is an apocalyptic number.

2021406 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2021406 is a wasteful number, since it uses less digits than its factorization.

2021406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336906.

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

The square root of 2021406 is about 1421.7615833887. The cubic root of 2021406 is about 126.4400086323.

Adding to 2021406 its reverse (6041202), we get a palindrome (8062608).

The spelling of 2021406 in words is "two million, twenty-one thousand, four hundred six".