138401725 has 36 divisors (see below), whose sum is σ = 217807488. Its totient is φ = 86268000.

The previous prime is 138401713. The next prime is 138401729. The reversal of 138401725 is 527104831.

It is not a de Polignac number, because 138401725 - 2⁵ = 138401693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138401729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 8340 + ... + 18610.

It is an arithmetic number, because the mean of its divisors is an integer number (6050208).

Almost surely, 2^138401725 is an apocalyptic number.

It is an amenable number.

138401725 is a deficient number, since it is larger than the sum of its proper divisors (79405763).

138401725 is a wasteful number, since it uses less digits than its factorization.

138401725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10306 (or 10294 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 138401725 is about 11764.4262503532. The cubic root of 138401725 is about 517.2658824165.

The spelling of 138401725 in words is "one hundred thirty-eight million, four hundred one thousand, seven hundred twenty-five".