406402231 has 2 divisors, whose sum is σ = 406402232. Its totient is φ = 406402230.

The previous prime is 406402147. The next prime is 406402237. The reversal of 406402231 is 132204604.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 406402231 - 2⁹ = 406401719 is a prime.

It is a super-2 number, since 2×406402231² = 330325546723554722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (406402237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203201115 + 203201116.

It is an arithmetic number, because the mean of its divisors is an integer number (203201116).

Almost surely, 2^406402231 is an apocalyptic number.

406402231 is a deficient number, since it is larger than the sum of its proper divisors (1).

406402231 is an equidigital number, since it uses as much as digits as its factorization.

406402231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 406402231 is about 20159.4204033747. The cubic root of 406402231 is about 740.7165150340.

Adding to 406402231 its reverse (132204604), we get a palindrome (538606835).

The spelling of 406402231 in words is "four hundred six million, four hundred two thousand, two hundred thirty-one".