1921738 has 16 divisors (see below), whose sum is σ = 3548160. Its totient is φ = 760176.

The previous prime is 1921729. The next prime is 1921739. The reversal of 1921738 is 8371291.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1921739) 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 7 ways as a sum of consecutive naturals, for example, 5098 + ... + 5461.

It is an arithmetic number, because the mean of its divisors is an integer number (221760).

2^1921738 is an apocalyptic number.

1921738 is a deficient number, since it is larger than the sum of its proper divisors (1626422).

1921738 is a wasteful number, since it uses less digits than its factorization.

1921738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10581.

The product of its digits is 3024, while the sum is 31.

The square root of 1921738 is about 1386.2676509246. The cubic root of 1921738 is about 124.3267914981.

The spelling of 1921738 in words is "one million, nine hundred twenty-one thousand, seven hundred thirty-eight".