406261997 has 2 divisors, whose sum is σ = 406261998. Its totient is φ = 406261996.

The previous prime is 406261909. The next prime is 406262029. The reversal of 406261997 is 799162604.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 403969801 + 2292196 = 20099^2 + 1514^2 .

It is a cyclic number.

It is not a de Polignac number, because 406261997 - 2⁸ = 406261741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (406263997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203130998 + 203130999.

It is an arithmetic number, because the mean of its divisors is an integer number (203130999).

Almost surely, 2^406261997 is an apocalyptic number.

It is an amenable number.

406261997 is a deficient number, since it is larger than the sum of its proper divisors (1).

406261997 is an equidigital number, since it uses as much as digits as its factorization.

406261997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 163296, while the sum is 44.

The square root of 406261997 is about 20155.9419774914. The cubic root of 406261997 is about 740.6313075050.

The spelling of 406261997 in words is "four hundred six million, two hundred sixty-one thousand, nine hundred ninety-seven".