139866449 has 8 divisors (see below), whose sum is σ = 145665000. Its totient is φ = 134132992.

The previous prime is 139866443. The next prime is 139866479. The reversal of 139866449 is 944668931.

It can be written as a sum of positive squares in 4 ways, for example, as 1380625 + 138485824 = 1175^2 + 11768^2 .

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 139866449 - 2⁸ = 139866193 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 139866397 and 139866406.

It is not an unprimeable number, because it can be changed into a prime (139866443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11864 + ... + 20505.

It is an arithmetic number, because the mean of its divisors is an integer number (18208125).

Almost surely, 2^139866449 is an apocalyptic number.

It is an amenable number.

139866449 is a deficient number, since it is larger than the sum of its proper divisors (5798551).

139866449 is a wasteful number, since it uses less digits than its factorization.

139866449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32547.

The product of its digits is 1119744, while the sum is 50.

The square root of 139866449 is about 11826.5146598649. The cubic root of 139866449 is about 519.0842474701.

The spelling of 139866449 in words is "one hundred thirty-nine million, eight hundred sixty-six thousand, four hundred forty-nine".