139181420 has 96 divisors (see below), whose sum is σ = 347851392. Its totient is φ = 45785088.

The previous prime is 139181401. The next prime is 139181423. The reversal of 139181420 is 24181931.

It is not an unprimeable number, because it can be changed into a prime (139181423) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 502322 + ... + 502598.

It is an arithmetic number, because the mean of its divisors is an integer number (3623452).

Almost surely, 2^139181420 is an apocalyptic number.

139181420 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 139181420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (173925696).

139181420 is an abundant number, since it is smaller than the sum of its proper divisors (208669972).

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

139181420 is a wasteful number, since it uses less digits than its factorization.

139181420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427 (or 425 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 139181420 is about 11797.5175354818. The cubic root of 139181420 is about 518.2354142312.

The spelling of 139181420 in words is "one hundred thirty-nine million, one hundred eighty-one thousand, four hundred twenty".