921398 has 8 divisors (see below), whose sum is σ = 1390608. Its totient is φ = 457864.

The previous prime is 921379. The next prime is 921407. The reversal of 921398 is 893129.

It is a sphenic number, since it is the product of 3 distinct primes.

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 921398.

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 in 3 ways as a sum of consecutive naturals, for example, 986 + ... + 1677.

It is an arithmetic number, because the mean of its divisors is an integer number (173826).

2⁹²¹³⁹⁸ is an apocalyptic number.

921398 is a deficient number, since it is larger than the sum of its proper divisors (469210).

921398 is a wasteful number, since it uses less digits than its factorization.

921398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2838.

The product of its digits is 3888, while the sum is 32.

The square root of 921398 is about 959.8947859010. The cubic root of 921398 is about 97.3081214281.

The spelling of 921398 in words is "nine hundred twenty-one thousand, three hundred ninety-eight".