421557 has 8 divisors (see below), whose sum is σ = 569184. Its totient is φ = 277488.

The previous prime is 421517. The next prime is 421559. The reversal of 421557 is 755124.

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

It is not a de Polignac number, because 421557 - 2⁶ = 421493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421559) 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, 598 + ... + 1095.

It is an arithmetic number, because the mean of its divisors is an integer number (71148).

2⁴²¹⁵⁵⁷ is an apocalyptic number.

It is an amenable number.

421557 is a deficient number, since it is larger than the sum of its proper divisors (147627).

421557 is a wasteful number, since it uses less digits than its factorization.

421557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1779.

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

The square root of 421557 is about 649.2742101763. The cubic root of 421557 is about 74.9811508187.

The spelling of 421557 in words is "four hundred twenty-one thousand, five hundred fifty-seven".