4640138 has 8 divisors (see below), whose sum is σ = 6996132. Its totient is φ = 2308096.

The previous prime is 4640137. The next prime is 4640143. The reversal of 4640138 is 8310464.

It can be written as a sum of positive squares in 2 ways, for example, as 3853369 + 786769 = 1963^2 + 887^2 .

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (4640131) 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, 5495 + ... + 6282.

Almost surely, 2^4640138 is an apocalyptic number.

4640138 is a deficient number, since it is larger than the sum of its proper divisors (2355994).

4640138 is a wasteful number, since it uses less digits than its factorization.

4640138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11976.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 4640138 is about 2154.0979550615. The cubic root of 4640138 is about 166.7926718233.

The spelling of 4640138 in words is "four million, six hundred forty thousand, one hundred thirty-eight".