139771 has 8 divisors (see below), whose sum is σ = 149760. Its totient is φ = 130152.

The previous prime is 139759. The next prime is 139787. The reversal of 139771 is 177931.

139771 = 31² + 32² + ... + 76².

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 139771 - 2⁵ = 139739 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139721) 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, 1306 + ... + 1408.

It is an arithmetic number, because the mean of its divisors is an integer number (18720).

2¹³⁹⁷⁷¹ is an apocalyptic number.

139771 is a deficient number, since it is larger than the sum of its proper divisors (9989).

139771 is a wasteful number, since it uses less digits than its factorization.

139771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185.

The product of its digits is 1323, while the sum is 28.

The square root of 139771 is about 373.8595993150. The cubic root of 139771 is about 51.8966141120.

The spelling of 139771 in words is "one hundred thirty-nine thousand, seven hundred seventy-one".