7157985 has 32 divisors (see below), whose sum is σ = 11950848. Its totient is φ = 3655680.

The previous prime is 7157981. The next prime is 7157987. The reversal of 7157985 is 5897517.

7157985 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 7157985 - 2² = 7157981 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7157981) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 63289 + ... + 63401.

It is an arithmetic number, because the mean of its divisors is an integer number (373464).

Almost surely, 2^7157985 is an apocalyptic number.

7157985 is the 1545-th octagonal number.

It is an amenable number.

7157985 is a deficient number, since it is larger than the sum of its proper divisors (4792863).

7157985 is a wasteful number, since it uses less digits than its factorization.

7157985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265.

The product of its digits is 88200, while the sum is 42.

The square root of 7157985 is about 2675.4410851297. The cubic root of 7157985 is about 192.7215417552.

The spelling of 7157985 in words is "seven million, one hundred fifty-seven thousand, nine hundred eighty-five".