1271396690 has 32 divisors (see below), whose sum is σ = 2326843584. Its totient is φ = 500068800.

The previous prime is 1271396681. The next prime is 1271396717. The reversal of 1271396690 is 966931721.

It is a super-2 number, since 2×1271396690² = 3232899086685912200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 468317 + ... + 471023.

It is an arithmetic number, because the mean of its divisors is an integer number (72713862).

Almost surely, 2^1271396690 is an apocalyptic number.

1271396690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1271396690 is a deficient number, since it is larger than the sum of its proper divisors (1055446894).

1271396690 is a wasteful number, since it uses less digits than its factorization.

1271396690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3482.

The product of its (nonzero) digits is 122472, while the sum is 44.

The square root of 1271396690 is about 35656.6500109026. The cubic root of 1271396690 is about 1083.3289743940.

The spelling of 1271396690 in words is "one billion, two hundred seventy-one million, three hundred ninety-six thousand, six hundred ninety".