2640273397 has 2 divisors, whose sum is σ = 2640273398. Its totient is φ = 2640273396.

The previous prime is 2640273367. The next prime is 2640273437. The reversal of 2640273397 is 7933720462.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1341463876 + 1298809521 = 36626^2 + 36039^2 .

It is a cyclic number.

It is not a de Polignac number, because 2640273397 - 2¹¹ = 2640271349 is a prime.

It is a super-2 number, since 2×2640273397² = 13942087221811839218, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2640273367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1320136698 + 1320136699.

It is an arithmetic number, because the mean of its divisors is an integer number (1320136699).

Almost surely, 2^2640273397 is an apocalyptic number.

It is an amenable number.

2640273397 is a deficient number, since it is larger than the sum of its proper divisors (1).

2640273397 is an equidigital number, since it uses as much as digits as its factorization.

2640273397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 381024, while the sum is 43.

The square root of 2640273397 is about 51383.5907367323. The cubic root of 2640273397 is about 1382.1323536731.

It can be divided in two parts, 26402 and 73397, that added together give a palindrome (99799).

The spelling of 2640273397 in words is "two billion, six hundred forty million, two hundred seventy-three thousand, three hundred ninety-seven".