1000281993 has 8 divisors (see below), whose sum is σ = 1333868256. Its totient is φ = 666775200.

The previous prime is 1000281959. The next prime is 1000282001. The reversal of 1000281993 is 3991820001.

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

It is a de Polignac number, because none of the positive numbers 2^k-1000281993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1000281913) 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, 22278 + ... + 49968.

It is an arithmetic number, because the mean of its divisors is an integer number (166733532).

Almost surely, 2^1000281993 is an apocalyptic number.

It is an amenable number.

1000281993 is a deficient number, since it is larger than the sum of its proper divisors (333586263).

1000281993 is a wasteful number, since it uses less digits than its factorization.

1000281993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39735.

The product of its (nonzero) digits is 3888, while the sum is 33.

The square root of 1000281993 is about 31627.2349882186. The cubic root of 1000281993 is about 1000.0939888325.

The spelling of 1000281993 in words is "one billion, two hundred eighty-one thousand, nine hundred ninety-three".