421877 has 4 divisors (see below), whose sum is σ = 426156. Its totient is φ = 417600.

The previous prime is 421847. The next prime is 421891. The reversal of 421877 is 778124.

421877 = 374² + 375² + 376².

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 398161 + 23716 = 631^2 + 154^2 .

It is a cyclic number.

It is not a de Polignac number, because 421877 - 2⁸ = 421621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421807) 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, 1988 + ... + 2189.

It is an arithmetic number, because the mean of its divisors is an integer number (106539).

2⁴²¹⁸⁷⁷ is an apocalyptic number.

It is an amenable number.

421877 is a deficient number, since it is larger than the sum of its proper divisors (4279).

421877 is a wasteful number, since it uses less digits than its factorization.

421877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4278.

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

The square root of 421877 is about 649.5205924372. The cubic root of 421877 is about 75.0001185183. Note that the first 3 decimals are identical.

The spelling of 421877 in words is "four hundred twenty-one thousand, eight hundred seventy-seven".