1993939 has 4 divisors (see below), whose sum is σ = 2080656. Its totient is φ = 1907224.

The previous prime is 1993933. The next prime is 1993949. The reversal of 1993939 is 9393991.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1993939 - 2³ = 1993931 is a prime.

It is an Ulam number.

It is a Duffinian number.

1993939 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1993895 and 1993904.

It is not an unprimeable number, because it can be changed into a prime (1993931) 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 3 ways as a sum of consecutive naturals, for example, 43324 + ... + 43369.

It is an arithmetic number, because the mean of its divisors is an integer number (520164).

2^1993939 is an apocalyptic number.

1993939 is a deficient number, since it is larger than the sum of its proper divisors (86717).

1993939 is an equidigital number, since it uses as much as digits as its factorization.

1993939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86716.

The product of its digits is 59049, while the sum is 43.

The square root of 1993939 is about 1412.0690493032. The cubic root of 1993939 is about 125.8647031809.

The spelling of 1993939 in words is "one million, nine hundred ninety-three thousand, nine hundred thirty-nine".