138650625 has 45 divisors (see below), whose sum is σ = 251865471. Its totient is φ = 73476000.

The previous prime is 138650593. The next prime is 138650627. The reversal of 138650625 is 526056831.

The square root of 138650625 is 11775.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 7 ways, for example, as 127441521 + 11209104 = 11289^2 + 3348^2 .

It is a tau number, because it is divible by the number of its divisors (45).

It is not a de Polignac number, because 138650625 - 2⁵ = 138650593 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 138650625.

It is not an unprimeable number, because it can be changed into a prime (138650627) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 883047 + ... + 883203.

Almost surely, 2^138650625 is an apocalyptic number.

138650625 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

138650625 is the 11775-th square number.

138650625 is the 5888-th centered octagonal number.

It is an amenable number.

138650625 is a deficient number, since it is larger than the sum of its proper divisors (113214846).

138650625 is an frugal number, since it uses more digits than its factorization.

138650625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340 (or 165 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The cubic root of 138650625 is about 517.5757783031.

Multiplying 138650625 by its sum of digits (36), we get a square (4991422500 = 70650²).

The spelling of 138650625 in words is "one hundred thirty-eight million, six hundred fifty thousand, six hundred twenty-five".