139791029 has 4 divisors (see below), whose sum is σ = 159761184. Its totient is φ = 119820876.

The previous prime is 139791023. The next prime is 139791031. The reversal of 139791029 is 920197931.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-139791029 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 (139791023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9985067 + ... + 9985080.

It is an arithmetic number, because the mean of its divisors is an integer number (39940296).

Almost surely, 2^139791029 is an apocalyptic number.

It is an amenable number.

139791029 is a deficient number, since it is larger than the sum of its proper divisors (19970155).

139791029 is an equidigital number, since it uses as much as digits as its factorization.

139791029 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19970154.

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

The square root of 139791029 is about 11823.3256319870. The cubic root of 139791029 is about 518.9909289911.

The spelling of 139791029 in words is "one hundred thirty-nine million, seven hundred ninety-one thousand, twenty-nine".