1142747 has 4 divisors (see below), whose sum is σ = 1145040. Its totient is φ = 1140456.

The previous prime is 1142737. The next prime is 1142759. The reversal of 1142747 is 7472411.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7472411 = 43 ⋅173777.

It is a cyclic number.

It is not a de Polignac number, because 1142747 - 2¹⁸ = 880603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1142707) 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, 47 + ... + 1512.

It is an arithmetic number, because the mean of its divisors is an integer number (286260).

2^1142747 is an apocalyptic number.

1142747 is a deficient number, since it is larger than the sum of its proper divisors (2293).

1142747 is an equidigital number, since it uses as much as digits as its factorization.

1142747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2292.

The product of its digits is 1568, while the sum is 26.

The square root of 1142747 is about 1068.9934518041. The cubic root of 1142747 is about 104.5482328872.

The spelling of 1142747 in words is "one million, one hundred forty-two thousand, seven hundred forty-seven".