139547897 has 4 divisors (see below), whose sum is σ = 139599696. Its totient is φ = 139496100.

The previous prime is 139547893. The next prime is 139547899. The reversal of 139547897 is 798745931.

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, and also an emirpimes, since its reverse is a distinct semiprime: 798745931 = 12653 ⋅63127.

It is a cyclic number.

It is not a de Polignac number, because 139547897 - 2² = 139547893 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139547893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21623 + ... + 27324.

It is an arithmetic number, because the mean of its divisors is an integer number (34899924).

Almost surely, 2^139547897 is an apocalyptic number.

It is an amenable number.

139547897 is a deficient number, since it is larger than the sum of its proper divisors (51799).

139547897 is an equidigital number, since it uses as much as digits as its factorization.

139547897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51798.

The product of its digits is 1905120, while the sum is 53.

The square root of 139547897 is about 11813.0392786954. The cubic root of 139547897 is about 518.6898688321.

The spelling of 139547897 in words is "one hundred thirty-nine million, five hundred forty-seven thousand, eight hundred ninety-seven".