1993378 has 4 divisors (see below), whose sum is σ = 2990070. Its totient is φ = 996688.

The previous prime is 1993367. The next prime is 1993417. The reversal of 1993378 is 8733991.

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

It can be written as a sum of positive squares in only one way, i.e., 1750329 + 243049 = 1323^2 + 493^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1993378.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498343 + ... + 498346.

2^1993378 is an apocalyptic number.

1993378 is a deficient number, since it is larger than the sum of its proper divisors (996692).

1993378 is an equidigital number, since it uses as much as digits as its factorization.

1993378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 996691.

The product of its digits is 40824, while the sum is 40.

The square root of 1993378 is about 1411.8703906521. The cubic root of 1993378 is about 125.8528979515.

The spelling of 1993378 in words is "one million, nine hundred ninety-three thousand, three hundred seventy-eight".