7991145 has 24 divisors (see below), whose sum is σ = 13920192. Its totient is φ = 4240800.

The previous prime is 7991129. The next prime is 7991147. The reversal of 7991145 is 5411997.

It is not a de Polignac number, because 7991145 - 2⁴ = 7991129 is a prime.

It is a super-2 number, since 2×7991145² = 127716796822050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7991147) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13710 + ... + 14280.

It is an arithmetic number, because the mean of its divisors is an integer number (580008).

Almost surely, 2^7991145 is an apocalyptic number.

It is an amenable number.

7991145 is a deficient number, since it is larger than the sum of its proper divisors (5929047).

7991145 is a wasteful number, since it uses less digits than its factorization.

7991145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 893 (or 890 counting only the distinct ones).

The product of its digits is 11340, while the sum is 36.

The square root of 7991145 is about 2826.8613337056. The cubic root of 7991145 is about 199.9261810905.

The spelling of 7991145 in words is "seven million, nine hundred ninety-one thousand, one hundred forty-five".