1057621 has 4 divisors (see below), whose sum is σ = 1119852. Its totient is φ = 995392.

The previous prime is 1057613. The next prime is 1057631. The reversal of 1057621 is 1267501.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 376996 + 680625 = 614^2 + 825^2 .

It is a cyclic number.

It is not a de Polignac number, because 1057621 - 2³ = 1057613 is a prime.

It is a super-2 number, since 2×1057621² = 2237124359282, which contains 22 as substring.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1057592 and 1057601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1057631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31090 + ... + 31123.

It is an arithmetic number, because the mean of its divisors is an integer number (279963).

2^1057621 is an apocalyptic number.

It is an amenable number.

1057621 is a deficient number, since it is larger than the sum of its proper divisors (62231).

1057621 is an equidigital number, since it uses as much as digits as its factorization.

1057621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62230.

The product of its (nonzero) digits is 420, while the sum is 22.

The square root of 1057621 is about 1028.4070205906. The cubic root of 1057621 is about 101.8849465240.

The spelling of 1057621 in words is "one million, fifty-seven thousand, six hundred twenty-one".