1993878 has 12 divisors (see below), whose sum is σ = 4320108. Its totient is φ = 664620.

The previous prime is 1993877. The next prime is 1993921. The reversal of 1993878 is 8783991.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1993877) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 55368 + ... + 55403.

It is an arithmetic number, because the mean of its divisors is an integer number (360009).

2^1993878 is an apocalyptic number.

1993878 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1993878 is an abundant number, since it is smaller than the sum of its proper divisors (2326230).

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

1993878 is a wasteful number, since it uses less digits than its factorization.

1993878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110779 (or 110776 counting only the distinct ones).

The product of its digits is 108864, while the sum is 45.

The square root of 1993878 is about 1412.0474496277. The cubic root of 1993878 is about 125.8634196536.

The spelling of 1993878 in words is "one million, nine hundred ninety-three thousand, eight hundred seventy-eight".