9875421 has 12 divisors (see below), whose sum is σ = 15015520. Its totient is φ = 6237000.

The previous prime is 9875417. The next prime is 9875429. The reversal of 9875421 is 1245789.

It is not a de Polignac number, because 9875421 - 2² = 9875417 is a prime.

It is a Duffinian 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 (9875429) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28705 + ... + 29046.

Almost surely, 2^9875421 is an apocalyptic number.

It is an amenable number.

9875421 is a deficient number, since it is larger than the sum of its proper divisors (5140099).

9875421 is a wasteful number, since it uses less digits than its factorization.

9875421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57776 (or 57773 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 9875421 is about 3142.5182577035. The cubic root of 9875421 is about 214.5450701583.

It can be divided in two parts, 9875 and 421, that added together give a triangular number (10296 = T₁₄₃).

The spelling of 9875421 in words is "nine million, eight hundred seventy-five thousand, four hundred twenty-one".