1281679 has 8 divisors (see below), whose sum is σ = 1472288. Its totient is φ = 1092960.

The previous prime is 1281677. The next prime is 1281691. The reversal of 1281679 is 9761821.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1281679 - 2¹ = 1281677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1281673) 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, 1609 + ... + 2269.

It is an arithmetic number, because the mean of its divisors is an integer number (184036).

2^1281679 is an apocalyptic number.

1281679 is a deficient number, since it is larger than the sum of its proper divisors (190609).

1281679 is an equidigital number, since it uses as much as digits as its factorization.

1281679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 945.

The product of its digits is 6048, while the sum is 34.

The square root of 1281679 is about 1132.1126269060. The cubic root of 1281679 is about 108.6241579545.

The spelling of 1281679 in words is "one million, two hundred eighty-one thousand, six hundred seventy-nine".