139725530 has 32 divisors (see below), whose sum is σ = 287853696. Its totient is φ = 47836224.

The previous prime is 139725497. The next prime is 139725539. The reversal of 139725530 is 35527931.

It is a happy number.

139725530 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×139725530³ (a number of 25 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (139725539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77297 + ... + 79083.

It is an arithmetic number, because the mean of its divisors is an integer number (8995428).

Almost surely, 2^139725530 is an apocalyptic number.

139725530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

139725530 is an abundant number, since it is smaller than the sum of its proper divisors (148128166).

139725530 is a wasteful number, since it uses less digits than its factorization.

139725530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2918.

The product of its (nonzero) digits is 28350, while the sum is 35.

The square root of 139725530 is about 11820.5554015029. Note that the first 3 decimals coincide. The cubic root of 139725530 is about 518.9098587019.

The spelling of 139725530 in words is "one hundred thirty-nine million, seven hundred twenty-five thousand, five hundred thirty".