7880989 has 2 divisors, whose sum is σ = 7880990. Its totient is φ = 7880988.

The previous prime is 7880969. The next prime is 7881023. The reversal of 7880989 is 9890887.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6708100 + 1172889 = 2590^2 + 1083^2 .

It is a cyclic number.

It is not a de Polignac number, because 7880989 - 2¹³ = 7872797 is a prime.

7880989 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7880909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3940494 + 3940495.

It is an arithmetic number, because the mean of its divisors is an integer number (3940495).

Almost surely, 2^7880989 is an apocalyptic number.

It is an amenable number.

7880989 is a deficient number, since it is larger than the sum of its proper divisors (1).

7880989 is an equidigital number, since it uses as much as digits as its factorization.

7880989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 290304, while the sum is 49.

The square root of 7880989 is about 2807.3099223278. The cubic root of 7880989 is about 199.0032826912.

The spelling of 7880989 in words is "seven million, eight hundred eighty thousand, nine hundred eighty-nine".