138440635 has 8 divisors (see below), whose sum is σ = 171857520. Its totient is φ = 106933344.

The previous prime is 138440629. The next prime is 138440647. The reversal of 138440635 is 536044831.

It is a happy number.

138440635 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 138440635 - 2¹³ = 138432443 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 138440635.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 477237 + ... + 477526.

It is an arithmetic number, because the mean of its divisors is an integer number (21482190).

Almost surely, 2^138440635 is an apocalyptic number.

138440635 is a deficient number, since it is larger than the sum of its proper divisors (33416885).

138440635 is an equidigital number, since it uses as much as digits as its factorization.

138440635 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 954797.

The product of its (nonzero) digits is 34560, while the sum is 34.

The square root of 138440635 is about 11766.0798484457. The cubic root of 138440635 is about 517.3143522595.

The spelling of 138440635 in words is "one hundred thirty-eight million, four hundred forty thousand, six hundred thirty-five".