138424725 has 36 divisors (see below), whose sum is σ = 249658500. Its totient is φ = 73313280.

The previous prime is 138424721. The next prime is 138424751. The reversal of 138424725 is 527424831.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 14814801 + 123609924 = 3849^2 + 11118^2 .

It is not a de Polignac number, because 138424725 - 2² = 138424721 is a prime.

It is a super-2 number, since 2×138424725² = 38322808982651250, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 138424725.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138424721) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 31461 + ... + 35589.

Almost surely, 2^138424725 is an apocalyptic number.

138424725 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138424725 is a deficient number, since it is larger than the sum of its proper divisors (111233775).

138424725 is a wasteful number, since it uses less digits than its factorization.

138424725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4294 (or 4286 counting only the distinct ones).

The product of its digits is 53760, while the sum is 36.

The square root of 138424725 is about 11765.4037329792. The cubic root of 138424725 is about 517.2945344108.

The spelling of 138424725 in words is "one hundred thirty-eight million, four hundred twenty-four thousand, seven hundred twenty-five".