139210897 has 8 divisors (see below), whose sum is σ = 159705216. Its totient is φ = 118868352.

The previous prime is 139210873. The next prime is 139210919. The reversal of 139210897 is 798012931.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139210897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139210847) 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, 35968 + ... + 39649.

It is an arithmetic number, because the mean of its divisors is an integer number (19963152).

Almost surely, 2^139210897 is an apocalyptic number.

It is an amenable number.

139210897 is a deficient number, since it is larger than the sum of its proper divisors (20494319).

139210897 is an equidigital number, since it uses as much as digits as its factorization.

139210897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75887.

The product of its (nonzero) digits is 27216, while the sum is 40.

The square root of 139210897 is about 11798.7667575895. The cubic root of 139210897 is about 518.2719970524.

The spelling of 139210897 in words is "one hundred thirty-nine million, two hundred ten thousand, eight hundred ninety-seven".