1921939 has 4 divisors (see below), whose sum is σ = 1958256. Its totient is φ = 1885624.

The previous prime is 1921937. The next prime is 1921967. The reversal of 1921939 is 9391291.

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

It is a cyclic number.

It is not a de Polignac number, because 1921939 - 2¹ = 1921937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1921937) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18079 + ... + 18184.

It is an arithmetic number, because the mean of its divisors is an integer number (489564).

2^1921939 is an apocalyptic number.

1921939 is a deficient number, since it is larger than the sum of its proper divisors (36317).

1921939 is an equidigital number, since it uses as much as digits as its factorization.

1921939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36316.

The product of its digits is 4374, while the sum is 34.

The square root of 1921939 is about 1386.3401458517. The cubic root of 1921939 is about 124.3311259103.

The spelling of 1921939 in words is "one million, nine hundred twenty-one thousand, nine hundred thirty-nine".