84877421 has 4 divisors (see below), whose sum is σ = 86947644. Its totient is φ = 82807200.

The previous prime is 84877393. The next prime is 84877451. The reversal of 84877421 is 12477848.

84877421 = 6514² + 6515².

It is a happy number.

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 42432196 + 42445225 = 6514^2 + 6515^2 .

It is a cyclic number.

It is not a de Polignac number, because 84877421 - 2⁶ = 84877357 is a prime.

It is a super-2 number, since 2×84877421² = 14408353191222482, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (41), and also a Moran number because the ratio is a prime number: 2070181 = 84877421 / (8 + 4 + 8 + 7 + 7 + 4 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84877451) 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, 1035050 + ... + 1035131.

It is an arithmetic number, because the mean of its divisors is an integer number (21736911).

Almost surely, 2^84877421 is an apocalyptic number.

84877421 is the 6515-th centered square number.

It is an amenable number.

84877421 is a deficient number, since it is larger than the sum of its proper divisors (2070223).

84877421 is a wasteful number, since it uses less digits than its factorization.

84877421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2070222.

The product of its digits is 100352, while the sum is 41.

The square root of 84877421 is about 9212.8942792154. The cubic root of 84877421 is about 439.4715090704.

The spelling of 84877421 in words is "eighty-four million, eight hundred seventy-seven thousand, four hundred twenty-one".