577421 has 4 divisors (see below), whose sum is σ = 621852. Its totient is φ = 532992.

The previous prime is 577399. The next prime is 577427. The reversal of 577421 is 124775.

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 44521 + 532900 = 211^2 + 730^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-577421 is a prime.

It is a super-2 number, since 2×577421² = 666830022482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (577427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22196 + ... + 22221.

It is an arithmetic number, because the mean of its divisors is an integer number (155463).

2⁵⁷⁷⁴²¹ is an apocalyptic number.

It is an amenable number.

577421 is a deficient number, since it is larger than the sum of its proper divisors (44431).

577421 is a wasteful number, since it uses less digits than its factorization.

577421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44430.

The product of its digits is 1960, while the sum is 26.

The square root of 577421 is about 759.8822277169. The cubic root of 577421 is about 83.2717180094.

The spelling of 577421 in words is "five hundred seventy-seven thousand, four hundred twenty-one".