7890091 has 8 divisors (see below), whose sum is σ = 9113904. Its totient is φ = 6750720.

The previous prime is 7890083. The next prime is 7890097. The reversal of 7890091 is 1900987.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7890091 - 2³ = 7890083 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7890097) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20910 + ... + 21283.

It is an arithmetic number, because the mean of its divisors is an integer number (1139238).

Almost surely, 2^7890091 is an apocalyptic number.

7890091 is a deficient number, since it is larger than the sum of its proper divisors (1223813).

7890091 is a wasteful number, since it uses less digits than its factorization.

7890091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42221.

The product of its (nonzero) digits is 4536, while the sum is 34.

The square root of 7890091 is about 2808.9305794199. The cubic root of 7890091 is about 199.0798649157.

It can be divided in two parts, 7 and 890091, that added together give a palindrome (890098).

The spelling of 7890091 in words is "seven million, eight hundred ninety thousand, ninety-one".