7742891 has 16 divisors (see below), whose sum is σ = 8702400. Its totient is φ = 6842880.

The previous prime is 7742887. The next prime is 7742923. The reversal of 7742891 is 1982477.

7742891 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 7742891 - 2² = 7742887 is a prime.

It is a super-2 number, since 2×7742891² = 119904722075762, which contains 22 as substring.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7747891) 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 15 ways as a sum of consecutive naturals, for example, 38810 + ... + 39008.

It is an arithmetic number, because the mean of its divisors is an integer number (543900).

Almost surely, 2^7742891 is an apocalyptic number.

7742891 is a deficient number, since it is larger than the sum of its proper divisors (959509).

7742891 is a wasteful number, since it uses less digits than its factorization.

7742891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326.

The product of its digits is 28224, while the sum is 38.

The square root of 7742891 is about 2782.6050743862. The cubic root of 7742891 is about 197.8340530453.

The spelling of 7742891 in words is "seven million, seven hundred forty-two thousand, eight hundred ninety-one".