557421 has 8 divisors (see below), whose sum is σ = 753984. Its totient is φ = 366240.

The previous prime is 557377. The next prime is 557423. The reversal of 557421 is 124755.

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

It is not a de Polignac number, because 557421 - 2¹³ = 549229 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 557391 and 557400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (557423) 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, 1096 + ... + 1521.

It is an arithmetic number, because the mean of its divisors is an integer number (94248).

2⁵⁵⁷⁴²¹ is an apocalyptic number.

It is an amenable number.

557421 is a deficient number, since it is larger than the sum of its proper divisors (196563).

557421 is a wasteful number, since it uses less digits than its factorization.

557421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2691.

The product of its digits is 1400, while the sum is 24.

The square root of 557421 is about 746.6063219663. The cubic root of 557421 is about 82.2989779827.

The spelling of 557421 in words is "five hundred fifty-seven thousand, four hundred twenty-one".