1142639 has 4 divisors (see below), whose sum is σ = 1169256. Its totient is φ = 1116024.

The previous prime is 1142633. The next prime is 1142651. The reversal of 1142639 is 9362411.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1142639 - 2²⁰ = 94063 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1142633) 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, 13244 + ... + 13329.

It is an arithmetic number, because the mean of its divisors is an integer number (292314).

2^1142639 is an apocalyptic number.

1142639 is a deficient number, since it is larger than the sum of its proper divisors (26617).

1142639 is an equidigital number, since it uses as much as digits as its factorization.

1142639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26616.

The product of its digits is 1296, while the sum is 26.

The square root of 1142639 is about 1068.9429358015. The cubic root of 1142639 is about 104.5449391966.

The spelling of 1142639 in words is "one million, one hundred forty-two thousand, six hundred thirty-nine".