8787421 has 4 divisors (see below), whose sum is σ = 8801532. Its totient is φ = 8773312.

The previous prime is 8787413. The next prime is 8787431. The reversal of 8787421 is 1247878.

8787421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 6446521 + 2340900 = 2539^2 + 1530^2 .

It is a cyclic number.

It is not a de Polignac number, because 8787421 - 2³ = 8787413 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 (8787431) 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, 6076 + ... + 7381.

It is an arithmetic number, because the mean of its divisors is an integer number (2200383).

Almost surely, 2^8787421 is an apocalyptic number.

It is an amenable number.

8787421 is a deficient number, since it is larger than the sum of its proper divisors (14111).

8787421 is a wasteful number, since it uses less digits than its factorization.

8787421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14110.

The product of its digits is 25088, while the sum is 37.

The square root of 8787421 is about 2964.3584466120. The cubic root of 8787421 is about 206.3576045794.

The spelling of 8787421 in words is "eight million, seven hundred eighty-seven thousand, four hundred twenty-one".