1271935978 has 4 divisors (see below), whose sum is σ = 1907903970. Its totient is φ = 635967988.

The previous prime is 1271935957. The next prime is 1271936047. The reversal of 1271935978 is 8795391721.

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

It can be written as a sum of positive squares in only one way, i.e., 937155769 + 334780209 = 30613^2 + 18297^2 .

It is a super-2 number, since 2×1271935978² = 3235642264261632968, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 317983993 + ... + 317983996.

Almost surely, 2^1271935978 is an apocalyptic number.

1271935978 is a deficient number, since it is larger than the sum of its proper divisors (635967992).

1271935978 is an equidigital number, since it uses as much as digits as its factorization.

1271935978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 635967991.

The product of its digits is 952560, while the sum is 52.

The square root of 1271935978 is about 35664.2114450888. The cubic root of 1271935978 is about 1083.4821245310.

The spelling of 1271935978 in words is "one billion, two hundred seventy-one million, nine hundred thirty-five thousand, nine hundred seventy-eight".