8742091 has 4 divisors (see below), whose sum is σ = 8750512. Its totient is φ = 8733672.

The previous prime is 8742077. The next prime is 8742103. The reversal of 8742091 is 1902478.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 8742091 - 2⁵ = 8742059 is a prime.

It is a Duffinian number.

8742091 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (8742011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2391 + ... + 4816.

It is an arithmetic number, because the mean of its divisors is an integer number (2187628).

Almost surely, 2^8742091 is an apocalyptic number.

8742091 is a deficient number, since it is larger than the sum of its proper divisors (8421).

8742091 is a wasteful number, since it uses less digits than its factorization.

8742091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8420.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 8742091 is about 2956.7027243198. The cubic root of 8742091 is about 206.0021600930.

The spelling of 8742091 in words is "eight million, seven hundred forty-two thousand, ninety-one".