7640389 has 6 divisors (see below), whose sum is σ = 7853874. Its totient is φ = 7432560.

The previous prime is 7640377. The next prime is 7640411. The reversal of 7640389 is 9830467.

It can be written as a sum of positive squares in 3 ways, for example, as 3572100 + 4068289 = 1890^2 + 2017^2 .

It is not a de Polignac number, because 7640389 - 2⁵ = 7640357 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7640329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1422 + ... + 4159.

It is an arithmetic number, because the mean of its divisors is an integer number (1308979).

Almost surely, 2^7640389 is an apocalyptic number.

It is an amenable number.

7640389 is a deficient number, since it is larger than the sum of its proper divisors (213485).

7640389 is an equidigital number, since it uses as much as digits as its factorization.

7640389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5655 (or 5618 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 7640389 is about 2764.1253589517. The cubic root of 7640389 is about 196.9571827548.

The spelling of 7640389 in words is "seven million, six hundred forty thousand, three hundred eighty-nine".