7898989 has 4 divisors (see below), whose sum is σ = 9027424. Its totient is φ = 6770556.

The previous prime is 7898983. The next prime is 7898993. The reversal of 7898989 is 9898987.

7898989 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 7898989 - 2³ = 7898981 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7898981) 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 3 ways as a sum of consecutive naturals, for example, 564207 + ... + 564220.

It is an arithmetic number, because the mean of its divisors is an integer number (2256856).

Almost surely, 2^7898989 is an apocalyptic number.

It is an amenable number.

7898989 is a deficient number, since it is larger than the sum of its proper divisors (1128435).

7898989 is a wasteful number, since it uses less digits than its factorization.

7898989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1128434.

The product of its digits is 2612736, while the sum is 58.

The square root of 7898989 is about 2810.5140099277. The cubic root of 7898989 is about 199.1546738187.

The spelling of 7898989 in words is "seven million, eight hundred ninety-eight thousand, nine hundred eighty-nine".