140268638 has 4 divisors (see below), whose sum is σ = 210402960. Its totient is φ = 70134318.

The previous prime is 140268631. The next prime is 140268647. The reversal of 140268638 is 836862041.

It is a happy number.

140268638 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140268631) by changing a digit.

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 as a sum of consecutive naturals, namely, 35067158 + ... + 35067161.

It is an arithmetic number, because the mean of its divisors is an integer number (52600740).

Almost surely, 2^140268638 is an apocalyptic number.

140268638 is a deficient number, since it is larger than the sum of its proper divisors (70134322).

140268638 is an equidigital number, since it uses as much as digits as its factorization.

140268638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70134321.

The product of its (nonzero) digits is 55296, while the sum is 38.

The square root of 140268638 is about 11843.5061531626. The cubic root of 140268638 is about 519.5813173236.

The spelling of 140268638 in words is "one hundred forty million, two hundred sixty-eight thousand, six hundred thirty-eight".