1920838 has 4 divisors (see below), whose sum is σ = 2881260. Its totient is φ = 960418.

The previous prime is 1920817. The next prime is 1920839. The reversal of 1920838 is 8380291.

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

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1920839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 480208 + ... + 480211.

It is an arithmetic number, because the mean of its divisors is an integer number (720315).

2^1920838 is an apocalyptic number.

1920838 is a deficient number, since it is larger than the sum of its proper divisors (960422).

1920838 is an equidigital number, since it uses as much as digits as its factorization.

1920838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 960421.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 1920838 is about 1385.9430002709. The cubic root of 1920838 is about 124.3073799750.

The spelling of 1920838 in words is "one million, nine hundred twenty thousand, eight hundred thirty-eight".