1139645 has 16 divisors (see below), whose sum is σ = 1496880. Its totient is φ = 827904.

The previous prime is 1139623. The next prime is 1139669. The reversal of 1139645 is 5469311.

It can be written as a sum of positive squares in 8 ways, for example, as 13924 + 1125721 = 118^2 + 1061^2 .

It is a cyclic number.

It is not a de Polignac number, because 1139645 - 2¹⁶ = 1074109 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5687 + ... + 5883.

It is an arithmetic number, because the mean of its divisors is an integer number (93555).

2^1139645 is an apocalyptic number.

It is an amenable number.

1139645 is a deficient number, since it is larger than the sum of its proper divisors (357235).

1139645 is a wasteful number, since it uses less digits than its factorization.

1139645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304.

The product of its digits is 3240, while the sum is 29.

The square root of 1139645 is about 1067.5415682773. The cubic root of 1139645 is about 104.4535480303.

The spelling of 1139645 in words is "one million, one hundred thirty-nine thousand, six hundred forty-five".