138018641 has 8 divisors (see below), whose sum is σ = 147746400. Its totient is φ = 128537280.

The previous prime is 138018637. The next prime is 138018659. The reversal of 138018641 is 146810831.

It is a happy number.

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

It is not a de Polignac number, because 138018641 - 2² = 138018637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 138018598 and 138018607.

It is not an unprimeable number, because it can be changed into a prime (138018611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60440 + ... + 62681.

It is an arithmetic number, because the mean of its divisors is an integer number (18468300).

Almost surely, 2^138018641 is an apocalyptic number.

It is an amenable number.

138018641 is a deficient number, since it is larger than the sum of its proper divisors (9727759).

138018641 is a wasteful number, since it uses less digits than its factorization.

138018641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123199.

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 138018641 is about 11748.1335113285. The cubic root of 138018641 is about 516.7881923409.

The spelling of 138018641 in words is "one hundred thirty-eight million, eighteen thousand, six hundred forty-one".