7840145 has 8 divisors (see below), whose sum is σ = 9961704. Its totient is φ = 5903104.

The previous prime is 7840081. The next prime is 7840153. The reversal of 7840145 is 5410487.

It can be written as a sum of positive squares in 4 ways, for example, as 1281424 + 6558721 = 1132^2 + 2561^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7840145 - 2⁶ = 7840081 is a prime.

It is a super-2 number, since 2×7840145² = 122935747242050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46034 + ... + 46203.

It is an arithmetic number, because the mean of its divisors is an integer number (1245213).

Almost surely, 2^7840145 is an apocalyptic number.

It is an amenable number.

7840145 is a deficient number, since it is larger than the sum of its proper divisors (2121559).

7840145 is a wasteful number, since it uses less digits than its factorization.

7840145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92259.

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 7840145 is about 2800.0258927374. The cubic root of 7840145 is about 198.6589023861.

The spelling of 7840145 in words is "seven million, eight hundred forty thousand, one hundred forty-five".