1921798 has 8 divisors (see below), whose sum is σ = 2922408. Its totient is φ = 947664.

The previous prime is 1921789. The next prime is 1921813. The reversal of 1921798 is 8971291.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6436 + ... + 6727.

It is an arithmetic number, because the mean of its divisors is an integer number (365301).

2^1921798 is an apocalyptic number.

1921798 is a deficient number, since it is larger than the sum of its proper divisors (1000610).

1921798 is a wasteful number, since it uses less digits than its factorization.

1921798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13238.

The product of its digits is 9072, while the sum is 37.

The square root of 1921798 is about 1386.2892915983. The cubic root of 1921798 is about 124.3280853841.

The spelling of 1921798 in words is "one million, nine hundred twenty-one thousand, seven hundred ninety-eight".