7661409 has 8 divisors (see below), whose sum is σ = 11674560. Its totient is φ = 4377936.

The previous prime is 7661399. The next prime is 7661411. The reversal of 7661409 is 9041667.

It is a happy number.

7661409 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 7661409 - 2⁴ = 7661393 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 7661409.

It is not an unprimeable number, because it can be changed into a prime (7660409) 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 7 ways as a sum of consecutive naturals, for example, 182394 + ... + 182435.

It is an arithmetic number, because the mean of its divisors is an integer number (1459320).

Almost surely, 2^7661409 is an apocalyptic number.

It is an amenable number.

7661409 is a deficient number, since it is larger than the sum of its proper divisors (4013151).

7661409 is a wasteful number, since it uses less digits than its factorization.

7661409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364839.

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 7661409 is about 2767.9250351120. The cubic root of 7661409 is about 197.1376381881.

The spelling of 7661409 in words is "seven million, six hundred sixty-one thousand, four hundred nine".