139920434915 has 4 divisors (see below), whose sum is σ = 167904521904. Its totient is φ = 111936347928.

The previous prime is 139920434911. The next prime is 139920434987. The reversal of 139920434915 is 519434029931.

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

It is a cyclic number.

It is not a de Polignac number, because 139920434915 - 2² = 139920434911 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139920434911) 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, 13992043487 + ... + 13992043496.

It is an arithmetic number, because the mean of its divisors is an integer number (41976130476).

Almost surely, 2^139920434915 is an apocalyptic number.

139920434915 is a deficient number, since it is larger than the sum of its proper divisors (27984086989).

139920434915 is an equidigital number, since it uses as much as digits as its factorization.

139920434915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27984086988.

The product of its (nonzero) digits is 1049760, while the sum is 50.

The spelling of 139920434915 in words is "one hundred thirty-nine billion, nine hundred twenty million, four hundred thirty-four thousand, nine hundred fifteen".