139405249 has 3 divisors (see below), whose sum is σ = 139417057. Its totient is φ = 139393442.

The previous prime is 139405241. The next prime is 139405267. The reversal of 139405249 is 942504931.

The square root of 139405249 is 11807.

It is a perfect power (a square), and thus also a powerful number.

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 not a de Polignac number, because 139405249 - 2³ = 139405241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139405241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 5904 + ... + 17710.

Almost surely, 2^139405249 is an apocalyptic number.

139405249 is the 11807-th square number.

139405249 is the 5904-th centered octagonal number.

It is an amenable number.

139405249 is a deficient number, since it is larger than the sum of its proper divisors (11808).

139405249 is an frugal number, since it uses more digits than its factorization.

139405249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23614 (or 11807 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 37.

The cubic root of 139405249 is about 518.5130709976.

The spelling of 139405249 in words is "one hundred thirty-nine million, four hundred five thousand, two hundred forty-nine".