1299621 has 4 divisors (see below), whose sum is σ = 1732832. Its totient is φ = 866412.

The previous prime is 1299601. The next prime is 1299631. The reversal of 1299621 is 1269921.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1269921 = 3 ⋅423307.

It is not a de Polignac number, because 1299621 - 2¹¹ = 1297573 is a prime.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1299601) 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 3 ways as a sum of consecutive naturals, for example, 216601 + ... + 216606.

It is an arithmetic number, because the mean of its divisors is an integer number (433208).

2^1299621 is an apocalyptic number.

It is an amenable number.

1299621 is a deficient number, since it is larger than the sum of its proper divisors (433211).

1299621 is an equidigital number, since it uses as much as digits as its factorization.

1299621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433210.

The product of its digits is 1944, while the sum is 30.

The square root of 1299621 is about 1140.0092104891. The cubic root of 1299621 is about 109.1286811752.

The spelling of 1299621 in words is "one million, two hundred ninety-nine thousand, six hundred twenty-one".