1921139 has 4 divisors (see below), whose sum is σ = 2095800. Its totient is φ = 1746480.

The previous prime is 1921133. The next prime is 1921159. The reversal of 1921139 is 9311291.

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 1921139 - 2⁴ = 1921123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1921133) by changing a digit.

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, 87314 + ... + 87335.

It is an arithmetic number, because the mean of its divisors is an integer number (523950).

2^1921139 is an apocalyptic number.

1921139 is a deficient number, since it is larger than the sum of its proper divisors (174661).

1921139 is a wasteful number, since it uses less digits than its factorization.

1921139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174660.

The product of its digits is 486, while the sum is 26.

The square root of 1921139 is about 1386.0515863416. The cubic root of 1921139 is about 124.3138727258.

It can be divided in two parts, 192 and 1139, that added together give a palindrome (1331).

The spelling of 1921139 in words is "one million, nine hundred twenty-one thousand, one hundred thirty-nine".