7901865 has 24 divisors (see below), whose sum is σ = 13857480. Its totient is φ = 4164864.

The previous prime is 7901863. The next prime is 7901893. The reversal of 7901865 is 5681097.

It can be written as a sum of positive squares in 4 ways, for example, as 144 + 7901721 = 12^2 + 2811^2 .

It is not a de Polignac number, because 7901865 - 2¹ = 7901863 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7901863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3019 + ... + 4991.

It is an arithmetic number, because the mean of its divisors is an integer number (577395).

Almost surely, 2^7901865 is an apocalyptic number.

It is an amenable number.

7901865 is a deficient number, since it is larger than the sum of its proper divisors (5955615).

7901865 is a wasteful number, since it uses less digits than its factorization.

7901865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2073 (or 2070 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 36.

The square root of 7901865 is about 2811.0256135439. The cubic root of 7901865 is about 199.1788414407.

The spelling of 7901865 in words is "seven million, nine hundred one thousand, eight hundred sixty-five".