8470521 has 32 divisors (see below), whose sum is σ = 13193600. Its totient is φ = 5365440.

The previous prime is 8470507. The next prime is 8470531. The reversal of 8470521 is 1250748.

It is not a de Polignac number, because 8470521 - 2⁵ = 8470489 is a prime.

It is a super-2 number, since 2×8470521² = 143499452022882, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8470531) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 60870 + ... + 61008.

It is an arithmetic number, because the mean of its divisors is an integer number (412300).

Almost surely, 2^8470521 is an apocalyptic number.

It is an amenable number.

8470521 is a deficient number, since it is larger than the sum of its proper divisors (4723079).

8470521 is a wasteful number, since it uses less digits than its factorization.

8470521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246 (or 240 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 8470521 is about 2910.4159496539. The cubic root of 8470521 is about 203.8465541594.

The spelling of 8470521 in words is "eight million, four hundred seventy thousand, five hundred twenty-one".