1066840393 has 4 divisors (see below), whose sum is σ = 1072201600. Its totient is φ = 1061479188.

The previous prime is 1066840361. The next prime is 1066840403. The reversal of 1066840393 is 3930486601.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1066840393 - 2⁵ = 1066840361 is a prime.

It is a super-2 number, since 2×1066840393² = 2276296848272788898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1066840693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2680305 + ... + 2680702.

It is an arithmetic number, because the mean of its divisors is an integer number (268050400).

Almost surely, 2^1066840393 is an apocalyptic number.

It is an amenable number.

1066840393 is a deficient number, since it is larger than the sum of its proper divisors (5361207).

1066840393 is an equidigital number, since it uses as much as digits as its factorization.

1066840393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5361206.

The product of its (nonzero) digits is 93312, while the sum is 40.

The square root of 1066840393 is about 32662.5227592726. The cubic root of 1066840393 is about 1021.8013769002.

The spelling of 1066840393 in words is "one billion, sixty-six million, eight hundred forty thousand, three hundred ninety-three".