1271865478 has 32 divisors (see below), whose sum is σ = 2103081120. Its totient is φ = 573281280.

The previous prime is 1271865457. The next prime is 1271865479. The reversal of 1271865478 is 8745681721.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1271865479) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 238198 + ... + 243478.

It is an arithmetic number, because the mean of its divisors is an integer number (65721285).

Almost surely, 2^1271865478 is an apocalyptic number.

1271865478 is a deficient number, since it is larger than the sum of its proper divisors (831215642).

1271865478 is a wasteful number, since it uses less digits than its factorization.

1271865478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5512.

The product of its digits is 752640, while the sum is 49.

The square root of 1271865478 is about 35663.2230455970. The cubic root of 1271865478 is about 1083.4621059917.

The spelling of 1271865478 in words is "one billion, two hundred seventy-one million, eight hundred sixty-five thousand, four hundred seventy-eight".