7641985 has 16 divisors (see below), whose sum is σ = 9994320. Its totient is φ = 5575680.

The previous prime is 7641983. The next prime is 7641989. The reversal of 7641985 is 5891467.

It can be written as a sum of positive squares in 8 ways, for example, as 238144 + 7403841 = 488^2 + 2721^2 .

It is not a de Polignac number, because 7641985 - 2¹ = 7641983 is a prime.

7641985 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7641983) 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 15 ways as a sum of consecutive naturals, for example, 5125 + ... + 6445.

It is an arithmetic number, because the mean of its divisors is an integer number (624645).

Almost surely, 2^7641985 is an apocalyptic number.

It is an amenable number.

7641985 is a deficient number, since it is larger than the sum of its proper divisors (2352335).

7641985 is a wasteful number, since it uses less digits than its factorization.

7641985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1428.

The product of its digits is 60480, while the sum is 40.

The square root of 7641985 is about 2764.4140427946. The cubic root of 7641985 is about 196.9708959212.

The spelling of 7641985 in words is "seven million, six hundred forty-one thousand, nine hundred eighty-five".