7640387 has 4 divisors (see below), whose sum is σ = 7652136. Its totient is φ = 7628640.

The previous prime is 7640377. The next prime is 7640411. The reversal of 7640387 is 7830467.

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

It is not a de Polignac number, because 7640387 - 2⁴ = 7640371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7640357) 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 3 ways as a sum of consecutive naturals, for example, 4838 + ... + 6219.

It is an arithmetic number, because the mean of its divisors is an integer number (1913034).

Almost surely, 2^7640387 is an apocalyptic number.

7640387 is a deficient number, since it is larger than the sum of its proper divisors (11749).

7640387 is a wasteful number, since it uses less digits than its factorization.

7640387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11748.

The product of its (nonzero) digits is 28224, while the sum is 35.

The square root of 7640387 is about 2764.1249971736. The cubic root of 7640387 is about 196.9571655691.

The spelling of 7640387 in words is "seven million, six hundred forty thousand, three hundred eighty-seven".