7874991 has 12 divisors (see below), whose sum is σ = 11617632. Its totient is φ = 5138016.

The previous prime is 7874983. The next prime is 7875013. The reversal of 7874991 is 1994787.

It is not a de Polignac number, because 7874991 - 2³ = 7874983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7874981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8886 + ... + 9731.

It is an arithmetic number, because the mean of its divisors is an integer number (968136).

Almost surely, 2^7874991 is an apocalyptic number.

7874991 is a deficient number, since it is larger than the sum of its proper divisors (3742641).

7874991 is a wasteful number, since it uses less digits than its factorization.

7874991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18670 (or 18667 counting only the distinct ones).

The product of its digits is 127008, while the sum is 45.

The square root of 7874991 is about 2806.2414365125. The cubic root of 7874991 is about 198.9527846032.

It can be divided in two parts, 787 and 4991, that added together give a triangular number (5778 = T₁₀₇).

The spelling of 7874991 in words is "seven million, eight hundred seventy-four thousand, nine hundred ninety-one".