139904220 has 96 divisors (see below), whose sum is σ = 436665600. Its totient is φ = 33260544.

The previous prime is 139904213. The next prime is 139904231. The reversal of 139904220 is 22409931.

139904220 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 15771 + ... + 22989.

It is an arithmetic number, because the mean of its divisors is an integer number (4548600).

Almost surely, 2^139904220 is an apocalyptic number.

139904220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 139904220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (218332800).

139904220 is an abundant number, since it is smaller than the sum of its proper divisors (296761380).

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

139904220 is a wasteful number, since it uses less digits than its factorization.

139904220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7267 (or 7265 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 139904220 is about 11828.1114299790. Note that the first 3 decimals coincide. The cubic root of 139904220 is about 519.1309695792.

The spelling of 139904220 in words is "one hundred thirty-nine million, nine hundred four thousand, two hundred twenty".