1267661 has 8 divisors (see below), whose sum is σ = 1346880. Its totient is φ = 1189728.

The previous prime is 1267649. The next prime is 1267663. The reversal of 1267661 is 1667621.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1267661 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1267663) 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 7 ways as a sum of consecutive naturals, for example, 2360 + ... + 2846.

It is an arithmetic number, because the mean of its divisors is an integer number (168360).

2^1267661 is an apocalyptic number.

It is an amenable number.

1267661 is a deficient number, since it is larger than the sum of its proper divisors (79219).

1267661 is a wasteful number, since it uses less digits than its factorization.

1267661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 643.

The product of its digits is 3024, while the sum is 29.

The square root of 1267661 is about 1125.9045252596. The cubic root of 1267661 is about 108.2266900582.

The spelling of 1267661 in words is "one million, two hundred sixty-seven thousand, six hundred sixty-one".