139729805 has 4 divisors (see below), whose sum is σ = 167675772. Its totient is φ = 111783840.

The previous prime is 139729789. The next prime is 139729823. The reversal of 139729805 is 508927931.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 70190884 + 69538921 = 8378^2 + 8339^2 .

It is not a de Polignac number, because 139729805 - 2⁴ = 139729789 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13972976 + ... + 13972985.

It is an arithmetic number, because the mean of its divisors is an integer number (41918943).

Almost surely, 2^139729805 is an apocalyptic number.

It is an amenable number.

139729805 is a deficient number, since it is larger than the sum of its proper divisors (27945967).

139729805 is an equidigital number, since it uses as much as digits as its factorization.

139729805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27945966.

The product of its (nonzero) digits is 136080, while the sum is 44.

The square root of 139729805 is about 11820.7362291864. The cubic root of 139729805 is about 518.9151507842.

The spelling of 139729805 in words is "one hundred thirty-nine million, seven hundred twenty-nine thousand, eight hundred five".