2039921 has 8 divisors (see below), whose sum is σ = 2256744. Its totient is φ = 1831680.

The previous prime is 2039911. The next prime is 2039927. The reversal of 2039921 is 1299302.

It can be written as a sum of positive squares in 4 ways, for example, as 960400 + 1079521 = 980^2 + 1039^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 2039921 - 2⁶ = 2039857 is a prime.

It is a super-2 number, since 2×2039921² = 8322555372482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2039927) 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, 1640 + ... + 2601.

It is an arithmetic number, because the mean of its divisors is an integer number (282093).

2^2039921 is an apocalyptic number.

It is an amenable number.

2039921 is a deficient number, since it is larger than the sum of its proper divisors (216823).

2039921 is a wasteful number, since it uses less digits than its factorization.

2039921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4291.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 2039921 is about 1428.2580299092. The cubic root of 2039921 is about 126.8248769469.

The spelling of 2039921 in words is "two million, thirty-nine thousand, nine hundred twenty-one".