1270664399 has 2 divisors, whose sum is σ = 1270664400. Its totient is φ = 1270664398.

The previous prime is 1270664383. The next prime is 1270664419. The reversal of 1270664399 is 9934660721.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1270664399 - 2⁴ = 1270664383 is a prime.

It is a super-2 number, since 2×1270664399² = 3229176029772062402, which contains 22 as substring.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1270664309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 635332199 + 635332200.

It is an arithmetic number, because the mean of its divisors is an integer number (635332200).

Almost surely, 2^1270664399 is an apocalyptic number.

1270664399 is a deficient number, since it is larger than the sum of its proper divisors (1).

1270664399 is an equidigital number, since it uses as much as digits as its factorization.

1270664399 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 489888, while the sum is 47.

The square root of 1270664399 is about 35646.3798863223. The cubic root of 1270664399 is about 1083.1209447990.

The spelling of 1270664399 in words is "one billion, two hundred seventy million, six hundred sixty-four thousand, three hundred ninety-nine".