139021799 has 8 divisors (see below), whose sum is σ = 158957568. Its totient is φ = 119104920.

The previous prime is 139021793. The next prime is 139021807. The reversal of 139021799 is 997120931.

139021799 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 139021799 - 2²⁴ = 122244583 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139021793) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19034 + ... + 25304.

It is an arithmetic number, because the mean of its divisors is an integer number (19869696).

Almost surely, 2^139021799 is an apocalyptic number.

139021799 is a deficient number, since it is larger than the sum of its proper divisors (19935769).

139021799 is an equidigital number, since it uses as much as digits as its factorization.

139021799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9445.

The product of its (nonzero) digits is 30618, while the sum is 41.

The square root of 139021799 is about 11790.7505698323. The cubic root of 139021799 is about 518.0372247067.

The spelling of 139021799 in words is "one hundred thirty-nine million, twenty-one thousand, seven hundred ninety-nine".