1220139 has 6 divisors (see below), whose sum is σ = 1762436. Its totient is φ = 813420.

The previous prime is 1220099. The next prime is 1220147. The reversal of 1220139 is 9310221.

It is a happy number.

It is not a de Polignac number, because 1220139 - 2¹² = 1216043 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220239) 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, 67777 + ... + 67794.

2^1220139 is an apocalyptic number.

1220139 is a deficient number, since it is larger than the sum of its proper divisors (542297).

1220139 is a wasteful number, since it uses less digits than its factorization.

1220139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135577 (or 135574 counting only the distinct ones).

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

The square root of 1220139 is about 1104.5990222701. The cubic root of 1220139 is about 106.8570309382.

The spelling of 1220139 in words is "one million, two hundred twenty thousand, one hundred thirty-nine".