139989421 has 8 divisors (see below), whose sum is σ = 164463264. Its totient is φ = 117473520.

The previous prime is 139989391. The next prime is 139989461. The reversal of 139989421 is 124989931.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 139989421 - 2¹¹ = 139987373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139989461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 489331 + ... + 489616.

It is an arithmetic number, because the mean of its divisors is an integer number (20557908).

Almost surely, 2^139989421 is an apocalyptic number.

139989421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

139989421 is a deficient number, since it is larger than the sum of its proper divisors (24473843).

139989421 is a wasteful number, since it uses less digits than its factorization.

139989421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 978971.

The product of its digits is 139968, while the sum is 46.

The square root of 139989421 is about 11831.7125134107. The cubic root of 139989421 is about 519.2363309521.

The spelling of 139989421 in words is "one hundred thirty-nine million, nine hundred eighty-nine thousand, four hundred twenty-one".