139721345 has 16 divisors (see below), whose sum is σ = 177147840. Its totient is φ = 105499584.

The previous prime is 139721311. The next prime is 139721347. The reversal of 139721345 is 543127931.

It is a cyclic number.

It is not a de Polignac number, because 139721345 - 2⁸ = 139721089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (139721347) 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, 24287 + ... + 29483.

It is an arithmetic number, because the mean of its divisors is an integer number (11071740).

Almost surely, 2^139721345 is an apocalyptic number.

It is an amenable number.

139721345 is a deficient number, since it is larger than the sum of its proper divisors (37426495).

139721345 is a wasteful number, since it uses less digits than its factorization.

139721345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5504.

The product of its digits is 22680, while the sum is 35.

The square root of 139721345 is about 11820.3783780385. The cubic root of 139721345 is about 518.9046779273.

The spelling of 139721345 in words is "one hundred thirty-nine million, seven hundred twenty-one thousand, three hundred forty-five".