1321969 has 8 divisors (see below), whose sum is σ = 1473408. Its totient is φ = 1175760.

The previous prime is 1321961. The next prime is 1321981. The reversal of 1321969 is 9691231.

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 1321969 - 2³ = 1321961 is a prime.

It is a super-2 number, since 2×1321969² = 3495204073922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1321969.

It is not an unprimeable number, because it can be changed into a prime (1321961) 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, 762 + ... + 1795.

It is an arithmetic number, because the mean of its divisors is an integer number (184176).

2^1321969 is an apocalyptic number.

It is an amenable number.

1321969 is a deficient number, since it is larger than the sum of its proper divisors (151439).

1321969 is a wasteful number, since it uses less digits than its factorization.

1321969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2615.

The product of its digits is 2916, while the sum is 31.

The square root of 1321969 is about 1149.7691072559. The cubic root of 1321969 is about 109.7506473050.

The spelling of 1321969 in words is "one million, three hundred twenty-one thousand, nine hundred sixty-nine".