140000638 has 4 divisors (see below), whose sum is σ = 210000960. Its totient is φ = 70000318.

The previous prime is 140000633. The next prime is 140000659. The reversal of 140000638 is 836000041.

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

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140000633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35000158 + ... + 35000161.

It is an arithmetic number, because the mean of its divisors is an integer number (52500240).

Almost surely, 2^140000638 is an apocalyptic number.

140000638 is a deficient number, since it is larger than the sum of its proper divisors (70000322).

140000638 is an equidigital number, since it uses as much as digits as its factorization.

140000638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70000321.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 140000638 is about 11832.1865265892. The cubic root of 140000638 is about 519.2501989485.

Adding to 140000638 its reverse (836000041), we get a palindrome (976000679).

The spelling of 140000638 in words is "one hundred forty million, six hundred thirty-eight", and thus it is an aban number.