139720825 has 24 divisors (see below), whose sum is σ = 178488576. Its totient is φ = 108432000.

The previous prime is 139720817. The next prime is 139720853. The reversal of 139720825 is 528027931.

It is not a de Polignac number, because 139720825 - 2³ = 139720817 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 277524 + ... + 278026.

It is an arithmetic number, because the mean of its divisors is an integer number (7437024).

Almost surely, 2^139720825 is an apocalyptic number.

It is an amenable number.

139720825 is a deficient number, since it is larger than the sum of its proper divisors (38767751).

139720825 is a wasteful number, since it uses less digits than its factorization.

139720825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 825 (or 820 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 139720825 is about 11820.3563821063. The cubic root of 139720825 is about 518.9040341918.

It can be divided in two parts, 1397 and 20825, that added together give a palindrome (22222).

The spelling of 139720825 in words is "one hundred thirty-nine million, seven hundred twenty thousand, eight hundred twenty-five".