138650401 has 4 divisors (see below), whose sum is σ = 139166100. Its totient is φ = 138134704.

The previous prime is 138650387. The next prime is 138650437. The reversal of 138650401 is 104056831.

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

It can be written as a sum of positive squares in 2 ways, for example, as 39050001 + 99600400 = 6249^2 + 9980^2 .

It is a cyclic number.

It is not a de Polignac number, because 138650401 - 2¹³ = 138642209 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 138650401.

It is not an unprimeable number, because it can be changed into a prime (138650471) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 257446 + ... + 257983.

It is an arithmetic number, because the mean of its divisors is an integer number (34791525).

Almost surely, 2^138650401 is an apocalyptic number.

It is an amenable number.

138650401 is a deficient number, since it is larger than the sum of its proper divisors (515699).

138650401 is an equidigital number, since it uses as much as digits as its factorization.

138650401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 515698.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 138650401 is about 11774.9904883189. The cubic root of 138650401 is about 517.5754995761.

The spelling of 138650401 in words is "one hundred thirty-eight million, six hundred fifty thousand, four hundred one".