406401271 has 2 divisors, whose sum is σ = 406401272. Its totient is φ = 406401270.

The previous prime is 406401257. The next prime is 406401277. The reversal of 406401271 is 172104604.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 406401271 - 2¹³ = 406393079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (406401277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203200635 + 203200636.

It is an arithmetic number, because the mean of its divisors is an integer number (203200636).

Almost surely, 2^406401271 is an apocalyptic number.

406401271 is a deficient number, since it is larger than the sum of its proper divisors (1).

406401271 is an equidigital number, since it uses as much as digits as its factorization.

406401271 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 406401271 is about 20159.3965931523. The cubic root of 406401271 is about 740.7159317954.

Adding to 406401271 its reverse (172104604), we get a palindrome (578505875).

The spelling of 406401271 in words is "four hundred six million, four hundred one thousand, two hundred seventy-one".