1221039 has 6 divisors (see below), whose sum is σ = 1763736. Its totient is φ = 814020.

The previous prime is 1221029. The next prime is 1221049. The reversal of 1221039 is 9301221.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1221029) and next prime (1221049).

It is not a de Polignac number, because 1221039 - 2⁸ = 1220783 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221019) 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 5 ways as a sum of consecutive naturals, for example, 67827 + ... + 67844.

It is an arithmetic number, because the mean of its divisors is an integer number (293956).

2^1221039 is an apocalyptic number.

1221039 is a deficient number, since it is larger than the sum of its proper divisors (542697).

1221039 is a wasteful number, since it uses less digits than its factorization.

1221039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135677 (or 135674 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 1221039 is about 1105.0063348235. The cubic root of 1221039 is about 106.8832978065.

The spelling of 1221039 in words is "one million, two hundred twenty-one thousand, thirty-nine".