1271920894 has 8 divisors (see below), whose sum is σ = 1929318480. Its totient is φ = 628814736.

The previous prime is 1271920883. The next prime is 1271920919. The reversal of 1271920894 is 4980291721.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1271920894.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3572634 + ... + 3572989.

It is an arithmetic number, because the mean of its divisors is an integer number (241164810).

Almost surely, 2^1271920894 is an apocalyptic number.

1271920894 is a deficient number, since it is larger than the sum of its proper divisors (657397586).

1271920894 is an equidigital number, since it uses as much as digits as its factorization.

1271920894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7145714.

The product of its (nonzero) digits is 72576, while the sum is 43.

The square root of 1271920894 is about 35663.9999719605. Note that the first 4 decimals coincide. The cubic root of 1271920894 is about 1083.4778414777.

The spelling of 1271920894 in words is "one billion, two hundred seventy-one million, nine hundred twenty thousand, eight hundred ninety-four".