891398 has 4 divisors (see below), whose sum is σ = 1337100. Its totient is φ = 445698.

The previous prime is 891391. The next prime is 891409. The reversal of 891398 is 893198.

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

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 891398.

It is not an unprimeable number, because it can be changed into a prime (891391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 222848 + ... + 222851.

It is an arithmetic number, because the mean of its divisors is an integer number (334275).

2⁸⁹¹³⁹⁸ is an apocalyptic number.

891398 is a deficient number, since it is larger than the sum of its proper divisors (445702).

891398 is a wasteful number, since it uses less digits than its factorization.

891398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445701.

The product of its digits is 15552, while the sum is 38.

The square root of 891398 is about 944.1387609880. The cubic root of 891398 is about 96.2403554737.

The spelling of 891398 in words is "eight hundred ninety-one thousand, three hundred ninety-eight".