1299021 has 8 divisors (see below), whose sum is σ = 1833984. Its totient is φ = 815040.

The previous prime is 1299019. The next prime is 1299029. The reversal of 1299021 is 1209921.

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

It is not a de Polignac number, because 1299021 - 2¹ = 1299019 is a prime.

1299021 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1298982 and 1299000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1299029) 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 7 ways as a sum of consecutive naturals, for example, 12685 + ... + 12786.

It is an arithmetic number, because the mean of its divisors is an integer number (229248).

2^1299021 is an apocalyptic number.

It is an amenable number.

1299021 is a deficient number, since it is larger than the sum of its proper divisors (534963).

1299021 is a wasteful number, since it uses less digits than its factorization.

1299021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25491.

The product of its (nonzero) digits is 324, while the sum is 24.

The square root of 1299021 is about 1139.7460243405. The cubic root of 1299021 is about 109.1118846661. Note that the first 3 decimals are identical.

The spelling of 1299021 in words is "one million, two hundred ninety-nine thousand, twenty-one".