8308721407 has 6 divisors (see below), whose sum is σ = 9665247408. Its totient is φ = 7121761164.

The previous prime is 8308721383. The next prime is 8308721453. The reversal of 8308721407 is 7041278038.

It is not a de Polignac number, because 8308721407 - 2¹¹ = 8308719359 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8308721407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8308721467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 84782823 + ... + 84782920.

It is an arithmetic number, because the mean of its divisors is an integer number (1610874568).

Almost surely, 2^8308721407 is an apocalyptic number.

8308721407 is a deficient number, since it is larger than the sum of its proper divisors (1356526001).

8308721407 is a wasteful number, since it uses less digits than its factorization.

8308721407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169565757 (or 169565750 counting only the distinct ones).

The product of its (nonzero) digits is 75264, while the sum is 40.

The square root of 8308721407 is about 91152.1881635323. The cubic root of 8308721407 is about 2025.4027675812.

The spelling of 8308721407 in words is "eight billion, three hundred eight million, seven hundred twenty-one thousand, four hundred seven".