139447220 has 48 divisors (see below), whose sum is σ = 324729216. Its totient is φ = 49872000.

The previous prime is 139447219. The next prime is 139447223. The reversal of 139447220 is 22744931.

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139447223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8225 + ... + 18615.

It is an arithmetic number, because the mean of its divisors is an integer number (6765192).

Almost surely, 2^139447220 is an apocalyptic number.

139447220 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 139447220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (162364608).

139447220 is an abundant number, since it is smaller than the sum of its proper divisors (185281996).

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

139447220 is a wasteful number, since it uses less digits than its factorization.

139447220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10472 (or 10470 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 139447220 is about 11808.7772440672. Note that the first 3 decimals coincide. The cubic root of 139447220 is about 518.5651023441.

The spelling of 139447220 in words is "one hundred thirty-nine million, four hundred forty-seven thousand, two hundred twenty".