406821061 has 4 divisors (see below), whose sum is σ = 407175052. Its totient is φ = 406467072.

The previous prime is 406821053. The next prime is 406821071. The reversal of 406821061 is 160128604.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 383924836 + 22896225 = 19594^2 + 4785^2 .

It is a cyclic number.

It is not a de Polignac number, because 406821061 - 2³ = 406821053 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 (406821011) 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, 175266 + ... + 177571.

It is an arithmetic number, because the mean of its divisors is an integer number (101793763).

Almost surely, 2^406821061 is an apocalyptic number.

It is an amenable number.

406821061 is a deficient number, since it is larger than the sum of its proper divisors (353991).

406821061 is a wasteful number, since it uses less digits than its factorization.

406821061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 353990.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 406821061 is about 20169.8056758116. The cubic root of 406821061 is about 740.9708835402.

Adding to 406821061 its reverse (160128604), we get a palindrome (566949665).

The spelling of 406821061 in words is "four hundred six million, eight hundred twenty-one thousand, sixty-one".