7991669 has 4 divisors (see below), whose sum is σ = 9133344. Its totient is φ = 6849996.

The previous prime is 7991657. The next prime is 7991701. The reversal of 7991669 is 9661997.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9661997 = 313 ⋅30869.

It is a cyclic number.

It is not a de Polignac number, because 7991669 - 2⁴ = 7991653 is a prime.

It is a super-2 number, since 2×7991669² = 127733546811122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7991629) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 570827 + ... + 570840.

It is an arithmetic number, because the mean of its divisors is an integer number (2283336).

Almost surely, 2^7991669 is an apocalyptic number.

It is an amenable number.

7991669 is a deficient number, since it is larger than the sum of its proper divisors (1141675).

7991669 is a wasteful number, since it uses less digits than its factorization.

7991669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1141674.

The product of its digits is 183708, while the sum is 47.

The square root of 7991669 is about 2826.9540144827. The cubic root of 7991669 is about 199.9305508869.

The spelling of 7991669 in words is "seven million, nine hundred ninety-one thousand, six hundred sixty-nine".