11406821 has 4 divisors (see below), whose sum is σ = 12007200. Its totient is φ = 10806444.

The previous prime is 11406809. The next prime is 11406823. The reversal of 11406821 is 12860411.

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 11406821 - 2¹⁸ = 11144677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11406823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 300161 + ... + 300198.

It is an arithmetic number, because the mean of its divisors is an integer number (3001800).

Almost surely, 2^11406821 is an apocalyptic number.

It is an amenable number.

11406821 is a deficient number, since it is larger than the sum of its proper divisors (600379).

11406821 is an equidigital number, since it uses as much as digits as its factorization.

11406821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 600378.

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 11406821 is about 3377.3985551012. The cubic root of 11406821 is about 225.1065898262.

The spelling of 11406821 in words is "eleven million, four hundred six thousand, eight hundred twenty-one".