1299921 has 24 divisors (see below), whose sum is σ = 2079360. Its totient is φ = 719712.

The previous prime is 1299919. The next prime is 1299941.

1299921 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 1299921 - 2¹ = 1299919 is a prime.

It is a Curzon number.

1299921 is a lucky number.

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (1299941) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5320 + ... + 5558.

It is an arithmetic number, because the mean of its divisors is an integer number (86640).

2^1299921 is an apocalyptic number.

It is an amenable number.

1299921 is a deficient number, since it is larger than the sum of its proper divisors (779439).

1299921 is a wasteful number, since it uses less digits than its factorization.

1299921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293 (or 286 counting only the distinct ones).

The product of its digits is 2916, while the sum is 33.

The square root of 1299921 is about 1140.1407807810. The cubic root of 1299921 is about 109.1370774911.

The spelling of 1299921 in words is "one million, two hundred ninety-nine thousand, nine hundred twenty-one".