8421497 has 8 divisors (see below), whose sum is σ = 9701376. Its totient is φ = 7160832.

The previous prime is 8421493. The next prime is 8421509. The reversal of 8421497 is 7941248.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 8421497 - 2² = 8421493 is a prime.

It is a super-2 number, since 2×8421497² = 141843223442018, which contains 22 as substring.

It is a d-powerful number, because it can be written as 8⁵ + 4² + 2²³ + 1 + 4² + 9² + 7 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8421493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3848 + ... + 5625.

It is an arithmetic number, because the mean of its divisors is an integer number (1212672).

Almost surely, 2^8421497 is an apocalyptic number.

It is an amenable number.

8421497 is a deficient number, since it is larger than the sum of its proper divisors (1279879).

8421497 is a wasteful number, since it uses less digits than its factorization.

8421497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9607.

The product of its digits is 16128, while the sum is 35.

The square root of 8421497 is about 2901.9815643798. The cubic root of 8421497 is about 203.4525321576.

Subtracting from 8421497 its reverse (7941248), we obtain a square (480249 = 693²).

The spelling of 8421497 in words is "eight million, four hundred twenty-one thousand, four hundred ninety-seven".