406228891 has 2 divisors, whose sum is σ = 406228892. Its totient is φ = 406228890.

The previous prime is 406228871. The next prime is 406228903. The reversal of 406228891 is 198822604.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 406228891 - 2⁵ = 406228859 is a prime.

It is not a weakly prime, because it can be changed into another prime (406228811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203114445 + 203114446.

It is an arithmetic number, because the mean of its divisors is an integer number (203114446).

Almost surely, 2^406228891 is an apocalyptic number.

406228891 is a deficient number, since it is larger than the sum of its proper divisors (1).

406228891 is an equidigital number, since it uses as much as digits as its factorization.

406228891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 55296, while the sum is 40.

The square root of 406228891 is about 20155.1207141014. The cubic root of 406228891 is about 740.6111891198.

The spelling of 406228891 in words is "four hundred six million, two hundred twenty-eight thousand, eight hundred ninety-one".