1993945 has 8 divisors (see below), whose sum is σ = 2415744. Its totient is φ = 1579824.

The previous prime is 1993933. The next prime is 1993949. The reversal of 1993945 is 5493991.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1993945 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1993898 and 1993907.

It is not an unprimeable number, because it can be changed into a prime (1993949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1329 + ... + 2398.

It is an arithmetic number, because the mean of its divisors is an integer number (301968).

2^1993945 is an apocalyptic number.

It is an amenable number.

1993945 is a deficient number, since it is larger than the sum of its proper divisors (421799).

1993945 is a wasteful number, since it uses less digits than its factorization.

1993945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3839.

The product of its digits is 43740, while the sum is 40.

The square root of 1993945 is about 1412.0711738436. The cubic root of 1993945 is about 125.8648294281.

The spelling of 1993945 in words is "one million, nine hundred ninety-three thousand, nine hundred forty-five".