139785601 has 4 divisors (see below), whose sum is σ = 140448304. Its totient is φ = 139122900.

The previous prime is 139785589. The next prime is 139785619. The reversal of 139785601 is 106587931.

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 cyclic number.

It is not a de Polignac number, because 139785601 - 2⁹ = 139785089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139785671) 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, 331035 + ... + 331456.

It is an arithmetic number, because the mean of its divisors is an integer number (35112076).

Almost surely, 2^139785601 is an apocalyptic number.

It is an amenable number.

139785601 is a deficient number, since it is larger than the sum of its proper divisors (662703).

139785601 is an equidigital number, since it uses as much as digits as its factorization.

139785601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 662702.

The product of its (nonzero) digits is 45360, while the sum is 40.

The square root of 139785601 is about 11823.0960835138. The cubic root of 139785601 is about 518.9842115375.

The spelling of 139785601 in words is "one hundred thirty-nine million, seven hundred eighty-five thousand, six hundred one".