139542049 has 4 divisors (see below), whose sum is σ = 139641264. Its totient is φ = 139442836.

The previous prime is 139542047. The next prime is 139542077. The reversal of 139542049 is 940245931.

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.

It is a cyclic number.

It is not a de Polignac number, because 139542049 - 2¹ = 139542047 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 139541999 and 139542017.

It is not an unprimeable number, because it can be changed into a prime (139542041) 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 3 ways as a sum of consecutive naturals, for example, 47467 + ... + 50320.

It is an arithmetic number, because the mean of its divisors is an integer number (34910316).

Almost surely, 2^139542049 is an apocalyptic number.

It is an amenable number.

139542049 is a deficient number, since it is larger than the sum of its proper divisors (99215).

139542049 is an equidigital number, since it uses as much as digits as its factorization.

139542049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99214.

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

The square root of 139542049 is about 11812.7917530108. The cubic root of 139542049 is about 518.6826231939.

The spelling of 139542049 in words is "one hundred thirty-nine million, five hundred forty-two thousand, forty-nine".