1939393 has 4 divisors (see below), whose sum is σ = 1945300. Its totient is φ = 1933488.

The previous prime is 1939381. The next prime is 1939397. The reversal of 1939393 is 3939391.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3939391 = 691 ⋅5701.

It can be written as a sum of positive squares in 2 ways, for example, as 1656369 + 283024 = 1287^2 + 532^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1939393 is a prime.

It is a super-2 number, since 2×1939393² = 7522490416898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1939397) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2430 + ... + 3127.

It is an arithmetic number, because the mean of its divisors is an integer number (486325).

2^1939393 is an apocalyptic number.

It is an amenable number.

1939393 is a deficient number, since it is larger than the sum of its proper divisors (5907).

1939393 is an equidigital number, since it uses as much as digits as its factorization.

1939393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5906.

The product of its digits is 19683, while the sum is 37.

The square root of 1939393 is about 1392.6209103701. The cubic root of 1939393 is about 124.7063614179.

It can be divided in two parts, 1939 and 393, that added together give a palindrome (2332).

The spelling of 1939393 in words is "one million, nine hundred thirty-nine thousand, three hundred ninety-three".