877421 has 4 divisors (see below), whose sum is σ = 929052. Its totient is φ = 825792.

The previous prime is 877411. The next prime is 877423. The reversal of 877421 is 124778.

877421 is nontrivially palindromic in base 16.

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 504100 + 373321 = 710^2 + 611^2 .

It is not a de Polignac number, because 877421 - 2¹⁴ = 861037 is a prime.

It is a super-2 number, since 2×877421² = 1539735222482, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (877423) 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, 25790 + ... + 25823.

It is an arithmetic number, because the mean of its divisors is an integer number (232263).

2⁸⁷⁷⁴²¹ is an apocalyptic number.

It is an amenable number.

877421 is a deficient number, since it is larger than the sum of its proper divisors (51631).

877421 is a wasteful number, since it uses less digits than its factorization.

877421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51630.

The product of its digits is 3136, while the sum is 29.

The square root of 877421 is about 936.7075317302. The cubic root of 877421 is about 95.7346913606.

The spelling of 877421 in words is "eight hundred seventy-seven thousand, four hundred twenty-one".