7842894091 has 4 divisors (see below), whose sum is σ = 7845476184. Its totient is φ = 7840312000.

The previous prime is 7842894079. The next prime is 7842894133. The reversal of 7842894091 is 1904982487.

It is a happy number.

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 7842894091 - 2¹³ = 7842885899 is a prime.

It is a super-3 number, since 3×7842894091³ (a number of 31 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7842894061) 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, 1286485 + ... + 1292566.

It is an arithmetic number, because the mean of its divisors is an integer number (1961369046).

Almost surely, 2^7842894091 is an apocalyptic number.

7842894091 is a deficient number, since it is larger than the sum of its proper divisors (2582093).

7842894091 is a wasteful number, since it uses less digits than its factorization.

7842894091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2582092.

The product of its (nonzero) digits is 1161216, while the sum is 52.

The square root of 7842894091 is about 88560.1156898522. The cubic root of 7842894091 is about 1986.8211911578.

The spelling of 7842894091 in words is "seven billion, eight hundred forty-two million, eight hundred ninety-four thousand, ninety-one".