1271979 has 12 divisors (see below), whose sum is σ = 1861600. Its totient is φ = 836784.

The previous prime is 1271971. The next prime is 1271987. The reversal of 1271979 is 9791721.

It is an interprime number because it is at equal distance from previous prime (1271971) and next prime (1271987).

It is not a de Polignac number, because 1271979 - 2³ = 1271971 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (1271971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 184 + ... + 1605.

2^1271979 is an apocalyptic number.

1271979 is a deficient number, since it is larger than the sum of its proper divisors (589621).

1271979 is a wasteful number, since it uses less digits than its factorization.

1271979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1874 (or 1871 counting only the distinct ones).

The product of its digits is 7938, while the sum is 36.

The square root of 1271979 is about 1127.8204644357. The cubic root of 1271979 is about 108.3494340304.

The spelling of 1271979 in words is "one million, two hundred seventy-one thousand, nine hundred seventy-nine".