921939 has 8 divisors (see below), whose sum is σ = 1271760. Its totient is φ = 593376.

The previous prime is 921931. The next prime is 921959. The reversal of 921939 is 939129.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 921939 - 2³ = 921931 is a prime.

It is not an unprimeable number, because it can be changed into a prime (921931) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5212 + ... + 5385.

It is an arithmetic number, because the mean of its divisors is an integer number (158970).

2⁹²¹⁹³⁹ is an apocalyptic number.

921939 is a deficient number, since it is larger than the sum of its proper divisors (349821).

921939 is a wasteful number, since it uses less digits than its factorization.

921939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10629.

The product of its digits is 4374, while the sum is 33.

The square root of 921939 is about 960.1765462664. The cubic root of 921939 is about 97.3271625641.

The spelling of 921939 in words is "nine hundred twenty-one thousand, nine hundred thirty-nine".