139890506 has 32 divisors (see below), whose sum is σ = 244702080. Its totient is φ = 58741056.

The previous prime is 139890503. The next prime is 139890523. The reversal of 139890506 is 605098931.

It is not an unprimeable number, because it can be changed into a prime (139890503) 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 15 ways as a sum of consecutive naturals, for example, 274580 + ... + 275088.

It is an arithmetic number, because the mean of its divisors is an integer number (7646940).

Almost surely, 2^139890506 is an apocalyptic number.

139890506 is a deficient number, since it is larger than the sum of its proper divisors (104811574).

139890506 is a wasteful number, since it uses less digits than its factorization.

139890506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 878.

The product of its (nonzero) digits is 58320, while the sum is 41.

The square root of 139890506 is about 11827.5316951594. The cubic root of 139890506 is about 519.1140065580.

The spelling of 139890506 in words is "one hundred thirty-nine million, eight hundred ninety thousand, five hundred six".