9170421 has 16 divisors (see below), whose sum is σ = 13331136. Its totient is φ = 5573376.

The previous prime is 9170417. The next prime is 9170423. The reversal of 9170421 is 1240719.

It is not a de Polignac number, because 9170421 - 2² = 9170417 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 9170391 and 9170400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9170423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1821 + ... + 4653.

It is an arithmetic number, because the mean of its divisors is an integer number (833196).

Almost surely, 2^9170421 is an apocalyptic number.

It is an amenable number.

9170421 is a deficient number, since it is larger than the sum of its proper divisors (4160715).

9170421 is a wasteful number, since it uses less digits than its factorization.

9170421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2932.

The product of its (nonzero) digits is 504, while the sum is 24.

The square root of 9170421 is about 3028.2702983717. The cubic root of 9170421 is about 209.3131071532.

It can be divided in two parts, 9170 and 421, that added together give a triangular number (9591 = T₁₃₈).

The spelling of 9170421 in words is "nine million, one hundred seventy thousand, four hundred twenty-one".