7871609 has 4 divisors (see below), whose sum is σ = 7929204. Its totient is φ = 7814016.

The previous prime is 7871599. The next prime is 7871621. The reversal of 7871609 is 9061787.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5221225 + 2650384 = 2285^2 + 1628^2 .

It is a cyclic number.

It is not a de Polignac number, because 7871609 - 2⁴ = 7871593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7874609) 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, 28592 + ... + 28865.

It is an arithmetic number, because the mean of its divisors is an integer number (1982301).

Almost surely, 2^7871609 is an apocalyptic number.

It is an amenable number.

7871609 is a deficient number, since it is larger than the sum of its proper divisors (57595).

7871609 is a wasteful number, since it uses less digits than its factorization.

7871609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57594.

The product of its (nonzero) digits is 21168, while the sum is 38.

The square root of 7871609 is about 2805.6387864442. The cubic root of 7871609 is about 198.9242997172.

The spelling of 7871609 in words is "seven million, eight hundred seventy-one thousand, six hundred nine".