2635944397 has 2 divisors, whose sum is σ = 2635944398. Its totient is φ = 2635944396.

The previous prime is 2635944373. The next prime is 2635944413. The reversal of 2635944397 is 7934495362.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2476654756 + 159289641 = 49766^2 + 12621^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2635944397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2635944307) 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, 1317972198 + 1317972199.

It is an arithmetic number, because the mean of its divisors is an integer number (1317972199).

Almost surely, 2^2635944397 is an apocalyptic number.

It is an amenable number.

2635944397 is a deficient number, since it is larger than the sum of its proper divisors (1).

2635944397 is an equidigital number, since it uses as much as digits as its factorization.

2635944397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4898880, while the sum is 52.

The square root of 2635944397 is about 51341.4491127783. The cubic root of 2635944397 is about 1381.3765577014.

It can be divided in two parts, 26359 and 44397, that added together give a square (70756 = 266²).

The spelling of 2635944397 in words is "two billion, six hundred thirty-five million, nine hundred forty-four thousand, three hundred ninety-seven".