139649 has 4 divisors (see below), whose sum is σ = 141636. Its totient is φ = 137664.

The previous prime is 139627. The next prime is 139661. The reversal of 139649 is 946931.

139649 is nontrivially palindromic in base 3.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 102400 + 37249 = 320^2 + 193^2 .

It is a cyclic number.

It is not a de Polignac number, because 139649 - 2⁸ = 139393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 884 + ... + 1029.

It is an arithmetic number, because the mean of its divisors is an integer number (35409).

2¹³⁹⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

139649 is a deficient number, since it is larger than the sum of its proper divisors (1987).

139649 is an equidigital number, since it uses as much as digits as its factorization.

139649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1986.

The product of its digits is 5832, while the sum is 32.

The square root of 139649 is about 373.6964008390. The cubic root of 139649 is about 51.8815102876.

The spelling of 139649 in words is "one hundred thirty-nine thousand, six hundred forty-nine".