139897 has 8 divisors (see below), whose sum is σ = 152000. Its totient is φ = 128304.

The previous prime is 139891. The next prime is 139901. The reversal of 139897 is 798931.

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 139897 - 2¹¹ = 137849 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

139897 is a lucky number.

It is a plaindrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (139891) 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, 604 + ... + 802.

It is an arithmetic number, because the mean of its divisors is an integer number (19000).

2¹³⁹⁸⁹⁷ is an apocalyptic number.

It is an amenable number.

139897 is a deficient number, since it is larger than the sum of its proper divisors (12103).

139897 is a wasteful number, since it uses less digits than its factorization.

139897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255.

The product of its digits is 13608, while the sum is 37.

The square root of 139897 is about 374.0280738126. The cubic root of 139897 is about 51.9122039207.

The spelling of 139897 in words is "one hundred thirty-nine thousand, eight hundred ninety-seven".