7897145 has 4 divisors (see below), whose sum is σ = 9476580. Its totient is φ = 6317712.

The previous prime is 7897063. The next prime is 7897147. The reversal of 7897145 is 5417987.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5417987 = 73 ⋅74219.

It can be written as a sum of positive squares in 2 ways, for example, as 1731856 + 6165289 = 1316^2 + 2483^2 .

It is a cyclic number.

It is not a de Polignac number, because 7897145 - 2²² = 3702841 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (7897147) 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, 789710 + ... + 789719.

It is an arithmetic number, because the mean of its divisors is an integer number (2369145).

Almost surely, 2^7897145 is an apocalyptic number.

It is an amenable number.

7897145 is a deficient number, since it is larger than the sum of its proper divisors (1579435).

7897145 is a wasteful number, since it uses less digits than its factorization.

7897145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1579434.

The product of its digits is 70560, while the sum is 41.

The square root of 7897145 is about 2810.1859369088. The cubic root of 7897145 is about 199.1391752192.

The spelling of 7897145 in words is "seven million, eight hundred ninety-seven thousand, one hundred forty-five".