991894 has 4 divisors (see below), whose sum is σ = 1487844. Its totient is φ = 495946.

The previous prime is 991889. The next prime is 991901. The reversal of 991894 is 498199.

991894 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 247972 + ... + 247975.

It is an arithmetic number, because the mean of its divisors is an integer number (371961).

2⁹⁹¹⁸⁹⁴ is an apocalyptic number.

991894 is a deficient number, since it is larger than the sum of its proper divisors (495950).

991894 is a wasteful number, since it uses less digits than its factorization.

991894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 495949.

The product of its digits is 23328, while the sum is 40.

The square root of 991894 is about 995.9387531370. The cubic root of 991894 is about 99.7290666139.

The spelling of 991894 in words is "nine hundred ninety-one thousand, eight hundred ninety-four".