1057421 has 2 divisors, whose sum is σ = 1057422. Its totient is φ = 1057420.

The previous prime is 1057411. The next prime is 1057477. The reversal of 1057421 is 1247501.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 714025 + 343396 = 845^2 + 586^2 .

It is an emirp because it is prime and its reverse (1247501) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1057421 is a prime.

It is a super-2 number, since 2×1057421² = 2236278342482, which contains 22 as substring.

It is a Chen prime.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 1057393 and 1057402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1057411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 528710 + 528711.

It is an arithmetic number, because the mean of its divisors is an integer number (528711).

2^1057421 is an apocalyptic number.

It is an amenable number.

1057421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1057421 is an equidigital number, since it uses as much as digits as its factorization.

1057421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 280, while the sum is 20.

The square root of 1057421 is about 1028.3097782283. The cubic root of 1057421 is about 101.8785238471.

The spelling of 1057421 in words is "one million, fifty-seven thousand, four hundred twenty-one".