1556139 has 8 divisors (see below), whose sum is σ = 2234512. Its totient is φ = 957600.

The previous prime is 1556117. The next prime is 1556147. The reversal of 1556139 is 9316551.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1556139 - 2⁷ = 1556011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1556179) 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, 19912 + ... + 19989.

It is an arithmetic number, because the mean of its divisors is an integer number (279314).

2^1556139 is an apocalyptic number.

1556139 is a deficient number, since it is larger than the sum of its proper divisors (678373).

1556139 is a wasteful number, since it uses less digits than its factorization.

1556139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39917.

The product of its digits is 4050, while the sum is 30.

The square root of 1556139 is about 1247.4530051268. The cubic root of 1556139 is about 115.8820392219.

The spelling of 1556139 in words is "one million, five hundred fifty-six thousand, one hundred thirty-nine".