7842091 has 4 divisors (see below), whose sum is σ = 8008992. Its totient is φ = 7675192.

The previous prime is 7842073. The next prime is 7842097. The reversal of 7842091 is 1902487.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 7842091 - 2⁵ = 7842059 is a prime.

It is a super-2 number, since 2×7842091² = 122996782504562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7842097) 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, 83380 + ... + 83473.

It is an arithmetic number, because the mean of its divisors is an integer number (2002248).

Almost surely, 2^7842091 is an apocalyptic number.

7842091 is a deficient number, since it is larger than the sum of its proper divisors (166901).

7842091 is a wasteful number, since it uses less digits than its factorization.

7842091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166900.

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

The square root of 7842091 is about 2800.3733679636. The cubic root of 7842091 is about 198.6753373816.

The spelling of 7842091 in words is "seven million, eight hundred forty-two thousand, ninety-one".