1278971 has 4 divisors (see below), whose sum is σ = 1291032. Its totient is φ = 1266912.

The previous prime is 1278911. The next prime is 1278983. The reversal of 1278971 is 1798721.

1278971 = T₉₈ + T₉₉ + ... + T₂₀₄.

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

It is a cyclic number.

It is not a de Polignac number, because 1278971 - 2¹⁴ = 1262587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1278911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5870 + ... + 6083.

It is an arithmetic number, because the mean of its divisors is an integer number (322758).

2^1278971 is an apocalyptic number.

1278971 is the 605-th centered heptagonal number.

1278971 is a deficient number, since it is larger than the sum of its proper divisors (12061).

1278971 is a wasteful number, since it uses less digits than its factorization.

1278971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12060.

The product of its digits is 7056, while the sum is 35.

The square root of 1278971 is about 1130.9160004174. The cubic root of 1278971 is about 108.5476016999.

The spelling of 1278971 in words is "one million, two hundred seventy-eight thousand, nine hundred seventy-one".