1040639 has 4 divisors (see below), whose sum is σ = 1074240. Its totient is φ = 1007040.

The previous prime is 1040629. The next prime is 1040651. The reversal of 1040639 is 9360401.

1040639 = 168² + 169² + ... + 198².

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9360401 = 1451 ⋅6451.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1040639 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1040629) 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, 16754 + ... + 16815.

It is an arithmetic number, because the mean of its divisors is an integer number (268560).

2^1040639 is an apocalyptic number.

1040639 is a deficient number, since it is larger than the sum of its proper divisors (33601).

1040639 is an equidigital number, since it uses as much as digits as its factorization.

1040639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33600.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 1040639 is about 1020.1171501352. The cubic root of 1040639 is about 101.3366864176.

The spelling of 1040639 in words is "one million, forty thousand, six hundred thirty-nine".