2057621 has 4 divisors (see below), whose sum is σ = 2067072. Its totient is φ = 2048172.

The previous prime is 2057611. The next prime is 2057633. The reversal of 2057621 is 1267502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1267502 = 2 ⋅633751.

It is a cyclic number.

It is not a de Polignac number, because 2057621 - 2¹⁰ = 2056597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2057611) 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 3 ways as a sum of consecutive naturals, for example, 4391 + ... + 4836.

It is an arithmetic number, because the mean of its divisors is an integer number (516768).

2^2057621 is an apocalyptic number.

It is an amenable number.

2057621 is a deficient number, since it is larger than the sum of its proper divisors (9451).

2057621 is an equidigital number, since it uses as much as digits as its factorization.

2057621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9450.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 2057621 is about 1434.4410061066. The cubic root of 2057621 is about 127.1906327569.

The spelling of 2057621 in words is "two million, fifty-seven thousand, six hundred twenty-one".