8421730 has 8 divisors (see below), whose sum is σ = 15159132. Its totient is φ = 3368688.

The previous prime is 8421727. The next prime is 8421733. The reversal of 8421730 is 371248.

It is an interprime number because it is at equal distance from previous prime (8421727) and next prime (8421733).

It can be written as a sum of positive squares in 2 ways, for example, as 8415801 + 5929 = 2901^2 + 77^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 8421695 and 8421704.

It is not an unprimeable number, because it can be changed into a prime (8421733) 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, 421077 + ... + 421096.

Almost surely, 2^8421730 is an apocalyptic number.

8421730 is a deficient number, since it is larger than the sum of its proper divisors (6737402).

8421730 is a wasteful number, since it uses less digits than its factorization.

8421730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 842180.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 8421730 is about 2902.0217090849. The cubic root of 8421730 is about 203.4544084670.

Adding to 8421730 its reverse (371248), we get a palindrome (8792978).

The spelling of 8421730 in words is "eight million, four hundred twenty-one thousand, seven hundred thirty".