406222681 has 4 divisors (see below), whose sum is σ = 407803572. Its totient is φ = 404641792.

The previous prime is 406222669. The next prime is 406222693. The reversal of 406222681 is 186222604.

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

It is an interprime number because it is at equal distance from previous prime (406222669) and next prime (406222693).

It can be written as a sum of positive squares in 2 ways, for example, as 308529225 + 97693456 = 17565^2 + 9884^2 .

It is a cyclic number.

It is not a de Polignac number, because 406222681 - 2¹³ = 406214489 is a prime.

It is a super-2 number, since 2×406222681² = 330033733117655522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (406222631) 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, 790060 + ... + 790573.

It is an arithmetic number, because the mean of its divisors is an integer number (101950893).

Almost surely, 2^406222681 is an apocalyptic number.

It is an amenable number.

406222681 is a deficient number, since it is larger than the sum of its proper divisors (1580891).

406222681 is a wasteful number, since it uses less digits than its factorization.

406222681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1580890.

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 406222681 is about 20154.9666583698. The cubic root of 406222681 is about 740.6074152056.

The spelling of 406222681 in words is "four hundred six million, two hundred twenty-two thousand, six hundred eighty-one".