1281993 has 8 divisors (see below), whose sum is σ = 1726656. Its totient is φ = 846000.

The previous prime is 1281983. The next prime is 1282007. The reversal of 1281993 is 3991821.

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

It is not a de Polignac number, because 1281993 - 2⁵ = 1281961 is a prime.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1281983) 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, 1813 + ... + 2418.

It is an arithmetic number, because the mean of its divisors is an integer number (215832).

2^1281993 is an apocalyptic number.

It is an amenable number.

1281993 is a deficient number, since it is larger than the sum of its proper divisors (444663).

1281993 is a wasteful number, since it uses less digits than its factorization.

1281993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4335.

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

The square root of 1281993 is about 1132.2512971951. The cubic root of 1281993 is about 108.6330278823.

The spelling of 1281993 in words is "one million, two hundred eighty-one thousand, nine hundred ninety-three".