2043621 has 36 divisors (see below), whose sum is σ = 3387852. Its totient is φ = 1181952.

The previous prime is 2043617. The next prime is 2043631. The reversal of 2043621 is 1263402.

It is a happy number.

2043621 is a `hidden beast` number, since 2 + 0 + 43 + 621 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1718721 + 324900 = 1311^2 + 570^2 .

It is not a de Polignac number, because 2043621 - 2² = 2043617 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2043594 and 2043603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2043631) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 55215 + ... + 55251.

It is an arithmetic number, because the mean of its divisors is an integer number (94107).

2^2043621 is an apocalyptic number.

It is an amenable number.

2043621 is a deficient number, since it is larger than the sum of its proper divisors (1344231).

2043621 is a wasteful number, since it uses less digits than its factorization.

2043621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98 (or 76 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 2043621 is about 1429.5527272542. The cubic root of 2043621 is about 126.9015087742.

The spelling of 2043621 in words is "two million, forty-three thousand, six hundred twenty-one".