139191720 has 128 divisors (see below), whose sum is σ = 450576000. Its totient is φ = 34283520.

The previous prime is 139191709. The next prime is 139191749. The reversal of 139191720 is 27191931.

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, 92736 + ... + 94224.

It is an arithmetic number, because the mean of its divisors is an integer number (3520125).

Almost surely, 2^139191720 is an apocalyptic number.

139191720 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 139191720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (225288000).

139191720 is an abundant number, since it is smaller than the sum of its proper divisors (311384280).

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

139191720 is a wasteful number, since it uses less digits than its factorization.

139191720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1563 (or 1559 counting only the distinct ones).

The product of its (nonzero) digits is 3402, while the sum is 33.

The square root of 139191720 is about 11797.9540599207. The cubic root of 139191720 is about 518.2481977696.

The spelling of 139191720 in words is "one hundred thirty-nine million, one hundred ninety-one thousand, seven hundred twenty".