7903985 has 4 divisors (see below), whose sum is σ = 9484788. Its totient is φ = 6323184.

The previous prime is 7903937. The next prime is 7903991. The reversal of 7903985 is 5893097.

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 5841889 + 2062096 = 2417^2 + 1436^2 .

It is a cyclic number.

It is not a de Polignac number, because 7903985 - 2¹⁴ = 7887601 is a prime.

It is a Duffinian number.

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, 790394 + ... + 790403.

It is an arithmetic number, because the mean of its divisors is an integer number (2371197).

Almost surely, 2^7903985 is an apocalyptic number.

It is an amenable number.

7903985 is a deficient number, since it is larger than the sum of its proper divisors (1580803).

7903985 is a wasteful number, since it uses less digits than its factorization.

7903985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1580802.

The product of its (nonzero) digits is 68040, while the sum is 41.

The square root of 7903985 is about 2811.4026748227. The cubic root of 7903985 is about 199.1966524843.

It can be divided in two parts, 7903 and 985, that added together give a palindrome (8888).

The spelling of 7903985 in words is "seven million, nine hundred three thousand, nine hundred eighty-five".