1271989814 has 8 divisors (see below), whose sum is σ = 1934121720. Its totient is φ = 627282576.

The previous prime is 1271989813. The next prime is 1271989819. The reversal of 1271989814 is 4189891721.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1271989813) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4355984 + ... + 4356275.

It is an arithmetic number, because the mean of its divisors is an integer number (241765215).

Almost surely, 2^1271989814 is an apocalyptic number.

1271989814 is a deficient number, since it is larger than the sum of its proper divisors (662131906).

1271989814 is an equidigital number, since it uses as much as digits as its factorization.

1271989814 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8712334.

The product of its digits is 290304, while the sum is 50.

The square root of 1271989814 is about 35664.9661993391. The cubic root of 1271989814 is about 1083.4974108142.

The spelling of 1271989814 in words is "one billion, two hundred seventy-one million, nine hundred eighty-nine thousand, eight hundred fourteen".