1045639 has 4 divisors (see below), whose sum is σ = 1195024. Its totient is φ = 896256.

The previous prime is 1045633. The next prime is 1045643. The reversal of 1045639 is 9365401.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9365401 = 1427 ⋅6563.

It is a cyclic number.

It is not a de Polignac number, because 1045639 - 2⁵ = 1045607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1045633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74682 + ... + 74695.

It is an arithmetic number, because the mean of its divisors is an integer number (298756).

2^1045639 is an apocalyptic number.

1045639 is a deficient number, since it is larger than the sum of its proper divisors (149385).

1045639 is an equidigital number, since it uses as much as digits as its factorization.

1045639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149384.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 1045639 is about 1022.5649123650. The cubic root of 1045639 is about 101.4987259905.

The spelling of 1045639 in words is "one million, forty-five thousand, six hundred thirty-nine".