139471 has 4 divisors (see below), whose sum is σ = 140344. Its totient is φ = 138600.

The previous prime is 139459. The next prime is 139483. The reversal of 139471 is 174931.

139471 is nontrivially palindromic in base 14.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is an interprime number because it is at equal distance from previous prime (139459) and next prime (139483).

It is a cyclic number.

It is not a de Polignac number, because 139471 - 2⁵ = 139439 is a prime.

It is a super-3 number, since 3×139471³ = 8139036555552333, which contains 333 as substring.

It is a Duffinian number.

139471 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139571) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 120 + ... + 541.

It is an arithmetic number, because the mean of its divisors is an integer number (35086).

2¹³⁹⁴⁷¹ is an apocalyptic number.

139471 is a deficient number, since it is larger than the sum of its proper divisors (873).

139471 is an equidigital number, since it uses as much as digits as its factorization.

139471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 872.

The product of its digits is 756, while the sum is 25.

The square root of 139471 is about 373.4581636542. The cubic root of 139471 is about 51.8594577719.

The spelling of 139471 in words is "one hundred thirty-nine thousand, four hundred seventy-one".