1993278 has 16 divisors (see below), whose sum is σ = 4556160. Its totient is φ = 569496.

The previous prime is 1993273. The next prime is 1993289. The reversal of 1993278 is 8723991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1993273) 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, 23688 + ... + 23771.

It is an arithmetic number, because the mean of its divisors is an integer number (284760).

2^1993278 is an apocalyptic number.

1993278 is an abundant number, since it is smaller than the sum of its proper divisors (2562882).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1993278 is a wasteful number, since it uses less digits than its factorization.

1993278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47471.

The product of its digits is 27216, while the sum is 39.

The square root of 1993278 is about 1411.8349761923. The cubic root of 1993278 is about 125.8507934000.

The spelling of 1993278 in words is "one million, nine hundred ninety-three thousand, two hundred seventy-eight".