84021730 has 48 divisors (see below), whose sum is σ = 166017600. Its totient is φ = 30598464.

The previous prime is 84021683. The next prime is 84021731. The reversal of 84021730 is 3712048.

It is a super-2 number, since 2×84021730² = 14119302224385800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 84021695 and 84021704.

It is not an unprimeable number, because it can be changed into a prime (84021731) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 139971 + ... + 140569.

It is an arithmetic number, because the mean of its divisors is an integer number (3458700).

Almost surely, 2^84021730 is an apocalyptic number.

84021730 is a deficient number, since it is larger than the sum of its proper divisors (81995870).

84021730 is a wasteful number, since it uses less digits than its factorization.

84021730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 715 (or 702 counting only the distinct ones).

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

The square root of 84021730 is about 9166.3367819429. The cubic root of 84021730 is about 437.9896753959.

Adding to 84021730 its reverse (3712048), we get a palindrome (87733778).

The spelling of 84021730 in words is "eighty-four million, twenty-one thousand, seven hundred thirty".