139591897 has 8 divisors (see below), whose sum is σ = 141467040. Its totient is φ = 137729280.

The previous prime is 139591891. The next prime is 139591919. The reversal of 139591897 is 798195931.

It is a happy number.

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 139591897 - 2⁷ = 139591769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139591891) 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, 20473 + ... + 26425.

It is an arithmetic number, because the mean of its divisors is an integer number (17683380).

Almost surely, 2^139591897 is an apocalyptic number.

It is an amenable number.

139591897 is a deficient number, since it is larger than the sum of its proper divisors (1875143).

139591897 is a wasteful number, since it uses less digits than its factorization.

139591897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6263.

The product of its digits is 612360, while the sum is 52.

The square root of 139591897 is about 11814.9014807573. The cubic root of 139591897 is about 518.7443780878.

The spelling of 139591897 in words is "one hundred thirty-nine million, five hundred ninety-one thousand, eight hundred ninety-seven".