1042639 has 8 divisors (see below), whose sum is σ = 1132880. Its totient is φ = 953856.

The previous prime is 1042633. The next prime is 1042681. The reversal of 1042639 is 9362401.

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

It is a cyclic number.

It is not a de Polignac number, because 1042639 - 2³ = 1042631 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 (1042631) 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, 1519 + ... + 2095.

It is an arithmetic number, because the mean of its divisors is an integer number (141610).

2^1042639 is an apocalyptic number.

1042639 is a deficient number, since it is larger than the sum of its proper divisors (90241).

1042639 is a wasteful number, since it uses less digits than its factorization.

1042639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 729.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 1042639 is about 1021.0969591572. The cubic root of 1042639 is about 101.4015643987.

It can be divided in two parts, 1042 and 639, that added together give a square (1681 = 41²).

The spelling of 1042639 in words is "one million, forty-two thousand, six hundred thirty-nine".