1271640026 has 16 divisors (see below), whose sum is σ = 1981547520. Its totient is φ = 611385840.

The previous prime is 1271640023. The next prime is 1271640043. The reversal of 1271640026 is 6200461721.

It is not an unprimeable number, because it can be changed into a prime (1271640023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55586 + ... + 75053.

It is an arithmetic number, because the mean of its divisors is an integer number (123846720).

Almost surely, 2^1271640026 is an apocalyptic number.

1271640026 is a deficient number, since it is larger than the sum of its proper divisors (709907494).

1271640026 is a wasteful number, since it uses less digits than its factorization.

1271640026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130829.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 1271640026 is about 35660.0620582747. The cubic root of 1271640026 is about 1083.3980837248.

The spelling of 1271640026 in words is "one billion, two hundred seventy-one million, six hundred forty thousand, twenty-six".