139989424 has 40 divisors (see below), whose sum is σ = 293887440. Its totient is φ = 64339968.

The previous prime is 139989391. The next prime is 139989461. The reversal of 139989424 is 424989931.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5712 + ... + 17680.

It is an arithmetic number, because the mean of its divisors is an integer number (7347186).

Almost surely, 2^139989424 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 139989424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (146943720).

139989424 is an abundant number, since it is smaller than the sum of its proper divisors (153898016).

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

139989424 is a wasteful number, since it uses less digits than its factorization.

139989424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12037 (or 12031 counting only the distinct ones).

The product of its digits is 559872, while the sum is 49.

The square root of 139989424 is about 11831.7126401887. The cubic root of 139989424 is about 519.2363346612.

The spelling of 139989424 in words is "one hundred thirty-nine million, nine hundred eighty-nine thousand, four hundred twenty-four".