139290728 has 16 divisors (see below), whose sum is σ = 263165760. Its totient is φ = 69113200.

The previous prime is 139290721. The next prime is 139290733. The reversal of 139290728 is 827092931.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (139290721) 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, 65408 + ... + 67503.

It is an arithmetic number, because the mean of its divisors is an integer number (16447860).

Almost surely, 2^139290728 is an apocalyptic number.

It is an amenable number.

139290728 is a deficient number, since it is larger than the sum of its proper divisors (123875032).

139290728 is a wasteful number, since it uses less digits than its factorization.

139290728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133048 (or 133044 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 139290728 is about 11802.1492957851. The cubic root of 139290728 is about 518.3710464479.

The spelling of 139290728 in words is "one hundred thirty-nine million, two hundred ninety thousand, seven hundred twenty-eight".