7640438 has 8 divisors (see below), whose sum is σ = 12342288. Its totient is φ = 3526344.

The previous prime is 7640419. The next prime is 7640443. The reversal of 7640438 is 8340467.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 146906 + ... + 146957.

It is an arithmetic number, because the mean of its divisors is an integer number (1542786).

Almost surely, 2^7640438 is an apocalyptic number.

7640438 is a deficient number, since it is larger than the sum of its proper divisors (4701850).

7640438 is a wasteful number, since it uses less digits than its factorization.

7640438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293878.

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 7640438 is about 2764.1342225008. The cubic root of 7640438 is about 196.9576038014.

The spelling of 7640438 in words is "seven million, six hundred forty thousand, four hundred thirty-eight".