406521287 has 2 divisors, whose sum is σ = 406521288. Its totient is φ = 406521286.

The previous prime is 406521223. The next prime is 406521299. The reversal of 406521287 is 782125604.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 406521287 - 2⁶ = 406521223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (406421287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203260643 + 203260644.

It is an arithmetic number, because the mean of its divisors is an integer number (203260644).

Almost surely, 2^406521287 is an apocalyptic number.

406521287 is a deficient number, since it is larger than the sum of its proper divisors (1).

406521287 is an equidigital number, since it uses as much as digits as its factorization.

406521287 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26880, while the sum is 35.

The square root of 406521287 is about 20162.3730498173. The cubic root of 406521287 is about 740.7888392231.

It can be divided in two parts, 4065 and 21287, that added together give a palindrome (25352).

The spelling of 406521287 in words is "four hundred six million, five hundred twenty-one thousand, two hundred eighty-seven".