139849 has 4 divisors (see below), whose sum is σ = 141264. Its totient is φ = 138436.

The previous prime is 139837. The next prime is 139861. The reversal of 139849 is 948931.

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: 948931 = 349 ⋅2719.

It is an interprime number because it is at equal distance from previous prime (139837) and next prime (139861).

It is a cyclic number.

It is not a de Polignac number, because 139849 - 2⁷ = 139721 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a nialpdrome in base 8.

It is not an unprimeable number, because it can be changed into a prime (131849) 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, 547 + ... + 760.

It is an arithmetic number, because the mean of its divisors is an integer number (35316).

2¹³⁹⁸⁴⁹ is an apocalyptic number.

It is an amenable number.

139849 is a deficient number, since it is larger than the sum of its proper divisors (1415).

139849 is a wasteful number, since it uses less digits than its factorization.

139849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1414.

The product of its digits is 7776, while the sum is 34.

The square root of 139849 is about 373.9639020012. The cubic root of 139849 is about 51.9062660502.

The spelling of 139849 in words is "one hundred thirty-nine thousand, eight hundred forty-nine".