1145639 has 4 divisors (see below), whose sum is σ = 1249800. Its totient is φ = 1041480.

The previous prime is 1145623. The next prime is 1145659. The reversal of 1145639 is 9365411.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9365411 = 11 ⋅851401.

It is not a de Polignac number, because 1145639 - 2⁴ = 1145623 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1145659) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52064 + ... + 52085.

It is an arithmetic number, because the mean of its divisors is an integer number (312450).

2^1145639 is an apocalyptic number.

1145639 is a deficient number, since it is larger than the sum of its proper divisors (104161).

1145639 is a wasteful number, since it uses less digits than its factorization.

1145639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104160.

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

The square root of 1145639 is about 1070.3452713961. The cubic root of 1145639 is about 104.6363535262.

The spelling of 1145639 in words is "one million, one hundred forty-five thousand, six hundred thirty-nine".