406036391 has 2 divisors, whose sum is σ = 406036392. Its totient is φ = 406036390.

The previous prime is 406036349. The next prime is 406036429. The reversal of 406036391 is 193630604.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 406036391 - 2¹⁸ = 405774247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (406036331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203018195 + 203018196.

It is an arithmetic number, because the mean of its divisors is an integer number (203018196).

Almost surely, 2^406036391 is an apocalyptic number.

406036391 is a deficient number, since it is larger than the sum of its proper divisors (1).

406036391 is an equidigital number, since it uses as much as digits as its factorization.

406036391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 32.

The square root of 406036391 is about 20150.3446868782. The cubic root of 406036391 is about 740.4941859699.

Adding to 406036391 its reverse (193630604), we get a palindrome (599666995).

The spelling of 406036391 in words is "four hundred six million, thirty-six thousand, three hundred ninety-one".