1252711399 has 4 divisors (see below), whose sum is σ = 1307177136. Its totient is φ = 1198245664.

The previous prime is 1252711393. The next prime is 1252711403. The reversal of 1252711399 is 9931172521.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1252711399 - 2⁵ = 1252711367 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1252711393) 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 in 3 ways as a sum of consecutive naturals, for example, 27232834 + ... + 27232879.

It is an arithmetic number, because the mean of its divisors is an integer number (326794284).

Almost surely, 2^1252711399 is an apocalyptic number.

1252711399 is a deficient number, since it is larger than the sum of its proper divisors (54465737).

1252711399 is an equidigital number, since it uses as much as digits as its factorization.

1252711399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54465736.

The product of its digits is 34020, while the sum is 40.

The square root of 1252711399 is about 35393.6632605330. The cubic root of 1252711399 is about 1077.9956534808.

The spelling of 1252711399 in words is "one billion, two hundred fifty-two million, seven hundred eleven thousand, three hundred ninety-nine".