7816145 has 4 divisors (see below), whose sum is σ = 9379380. Its totient is φ = 6252912.

The previous prime is 7816121. The next prime is 7816157. The reversal of 7816145 is 5416187.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6115729 + 1700416 = 2473^2 + 1304^2 .

It is a cyclic number.

It is not a de Polignac number, because 7816145 - 2¹⁴ = 7799761 is a prime.

It is a super-2 number, since 2×7816145² = 122184245322050, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 781610 + ... + 781619.

It is an arithmetic number, because the mean of its divisors is an integer number (2344845).

Almost surely, 2^7816145 is an apocalyptic number.

It is an amenable number.

7816145 is a deficient number, since it is larger than the sum of its proper divisors (1563235).

7816145 is a wasteful number, since it uses less digits than its factorization.

7816145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1563234.

The product of its digits is 6720, while the sum is 32.

The square root of 7816145 is about 2795.7369332611. The cubic root of 7816145 is about 198.4559857745.

The spelling of 7816145 in words is "seven million, eight hundred sixteen thousand, one hundred forty-five".