7998705 has 72 divisors (see below), whose sum is σ = 16556904. Its totient is φ = 3548160.

The previous prime is 7998703. The next prime is 7998719. The reversal of 7998705 is 5078997.

It can be written as a sum of positive squares in 4 ways, for example, as 314721 + 7683984 = 561^2 + 2772^2 .

It is not a de Polignac number, because 7998705 - 2¹ = 7998703 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (7998701) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 70729 + ... + 70841.

It is an arithmetic number, because the mean of its divisors is an integer number (229957).

Almost surely, 2^7998705 is an apocalyptic number.

It is an amenable number.

7998705 is an abundant number, since it is smaller than the sum of its proper divisors (8558199).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7998705 is a wasteful number, since it uses less digits than its factorization.

7998705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159 (or 145 counting only the distinct ones).

The product of its (nonzero) digits is 158760, while the sum is 45.

The square root of 7998705 is about 2828.1981896607. The cubic root of 7998705 is about 199.9892077510.

The spelling of 7998705 in words is "seven million, nine hundred ninety-eight thousand, seven hundred five".