139405220 has 24 divisors (see below), whose sum is σ = 293214264. Its totient is φ = 55673856.

The previous prime is 139405193. The next prime is 139405241. The reversal of 139405220 is 22504931.

It can be written as a sum of positive squares in 4 ways, for example, as 7431076 + 131974144 = 2726^2 + 11488^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 139405220.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 8282 + ... + 18638.

It is an arithmetic number, because the mean of its divisors is an integer number (12217261).

Almost surely, 2^139405220 is an apocalyptic number.

139405220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

139405220 is an abundant number, since it is smaller than the sum of its proper divisors (153809044).

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

139405220 is a wasteful number, since it uses less digits than its factorization.

139405220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11039 (or 11037 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 139405220 is about 11806.9987719149. The cubic root of 139405220 is about 518.5130350428.

The spelling of 139405220 in words is "one hundred thirty-nine million, four hundred five thousand, two hundred twenty".