7920345 has 16 divisors (see below), whose sum is σ = 13082112. Its totient is φ = 4087680.

The previous prime is 7920343. The next prime is 7920347. The reversal of 7920345 is 5430297.

It is an interprime number because it is at equal distance from previous prime (7920343) and next prime (7920347).

It is not a de Polignac number, because 7920345 - 2¹ = 7920343 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (7920343) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8052 + ... + 8981.

It is an arithmetic number, because the mean of its divisors is an integer number (817632).

Almost surely, 2^7920345 is an apocalyptic number.

It is an amenable number.

7920345 is a deficient number, since it is larger than the sum of its proper divisors (5161767).

7920345 is a wasteful number, since it uses less digits than its factorization.

7920345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17072.

The product of its (nonzero) digits is 7560, while the sum is 30.

The square root of 7920345 is about 2814.3107504325. The cubic root of 7920345 is about 199.3339929683. Note that the first 3 decimals are identical.

The spelling of 7920345 in words is "seven million, nine hundred twenty thousand, three hundred forty-five".