7838991 has 16 divisors (see below), whose sum is σ = 11673600. Its totient is φ = 5198904.

The previous prime is 7838969. The next prime is 7839011. The reversal of 7838991 is 1998387.

It is not a de Polignac number, because 7838991 - 2¹⁰ = 7837967 is a prime.

It is a super-2 number, since 2×7838991² = 122899559796162, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7838951) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5490 + ... + 6768.

It is an arithmetic number, because the mean of its divisors is an integer number (729600).

Almost surely, 2^7838991 is an apocalyptic number.

7838991 is a deficient number, since it is larger than the sum of its proper divisors (3834609).

7838991 is a wasteful number, since it uses less digits than its factorization.

7838991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1515 (or 1509 counting only the distinct ones).

The product of its digits is 108864, while the sum is 45.

The square root of 7838991 is about 2799.8198156310. The cubic root of 7838991 is about 198.6491549634.

The spelling of 7838991 in words is "seven million, eight hundred thirty-eight thousand, nine hundred ninety-one".