139688325 has 72 divisors (see below), whose sum is σ = 295266816. Its totient is φ = 61776000.

The previous prime is 139688321. The next prime is 139688401. The reversal of 139688325 is 523886931.

It is a happy number.

It is not a de Polignac number, because 139688325 - 2² = 139688321 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139688321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 47395 + ... + 50255.

It is an arithmetic number, because the mean of its divisors is an integer number (4100928).

Almost surely, 2^139688325 is an apocalyptic number.

139688325 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

139688325 is an abundant number, since it is smaller than the sum of its proper divisors (155578491).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

139688325 is a wasteful number, since it uses less digits than its factorization.

139688325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2915 (or 2907 counting only the distinct ones).

The product of its digits is 311040, while the sum is 45.

The square root of 139688325 is about 11818.9815551087. The cubic root of 139688325 is about 518.8637975535.

The spelling of 139688325 in words is "one hundred thirty-nine million, six hundred eighty-eight thousand, three hundred twenty-five".