403640400391 has 2 divisors, whose sum is σ = 403640400392. Its totient is φ = 403640400390.

The previous prime is 403640400367. The next prime is 403640400409. The reversal of 403640400391 is 193004046304.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 403640400391 - 2²¹ = 403638303239 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (403640400311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201820200195 + 201820200196.

It is an arithmetic number, because the mean of its divisors is an integer number (201820200196).

Almost surely, 2^403640400391 is an apocalyptic number.

403640400391 is a deficient number, since it is larger than the sum of its proper divisors (1).

403640400391 is an equidigital number, since it uses as much as digits as its factorization.

403640400391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 34.

Adding to 403640400391 its reverse (193004046304), we get a palindrome (596644446695).

The spelling of 403640400391 in words is "four hundred three billion, six hundred forty million, four hundred thousand, three hundred ninety-one".