1921959 has 12 divisors (see below), whose sum is σ = 2989896. Its totient is φ = 1182672.

The previous prime is 1921937. The next prime is 1921967. The reversal of 1921959 is 9591291.

It is not a de Polignac number, because 1921959 - 2¹⁵ = 1889191 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1921919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8097 + ... + 8330.

It is an arithmetic number, because the mean of its divisors is an integer number (249158).

2^1921959 is an apocalyptic number.

1921959 is a deficient number, since it is larger than the sum of its proper divisors (1067937).

1921959 is a wasteful number, since it uses less digits than its factorization.

1921959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16446 (or 16443 counting only the distinct ones).

The product of its digits is 7290, while the sum is 36.

The square root of 1921959 is about 1386.3473590699. The cubic root of 1921959 is about 124.3315571785.

The spelling of 1921959 in words is "one million, nine hundred twenty-one thousand, nine hundred fifty-nine".