1568139 has 8 divisors (see below), whose sum is σ = 2096640. Its totient is φ = 1042536.

The previous prime is 1568129. The next prime is 1568141. The reversal of 1568139 is 9318651.

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

It is not a de Polignac number, because 1568139 - 2⁴ = 1568123 is a prime.

1568139 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1568129) 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, 1794 + ... + 2520.

It is an arithmetic number, because the mean of its divisors is an integer number (262080).

2^1568139 is an apocalyptic number.

1568139 is a deficient number, since it is larger than the sum of its proper divisors (528501).

1568139 is an equidigital number, since it uses as much as digits as its factorization.

1568139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1449.

The product of its digits is 6480, while the sum is 33.

The square root of 1568139 is about 1252.2535685715. The cubic root of 1568139 is about 116.1791474832.

The spelling of 1568139 in words is "one million, five hundred sixty-eight thousand, one hundred thirty-nine".