1220185139 has 8 divisors (see below), whose sum is σ = 1230901248. Its totient is φ = 1209486600.

The previous prime is 1220185129. The next prime is 1220185147. The reversal of 1220185139 is 9315810221.

It is a happy number.

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 1220185139 - 2⁴ = 1220185123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220185129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 162314 + ... + 169664.

It is an arithmetic number, because the mean of its divisors is an integer number (153862656).

Almost surely, 2^1220185139 is an apocalyptic number.

1220185139 is a deficient number, since it is larger than the sum of its proper divisors (10716109).

1220185139 is a wasteful number, since it uses less digits than its factorization.

1220185139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8785.

The product of its (nonzero) digits is 4320, while the sum is 32.

The square root of 1220185139 is about 34931.1485496827. The cubic root of 1220185139 is about 1068.5837783783.

The spelling of 1220185139 in words is "one billion, two hundred twenty million, one hundred eighty-five thousand, one hundred thirty-nine".