139857545 has 4 divisors (see below), whose sum is σ = 167829060. Its totient is φ = 111886032.

The previous prime is 139857539. The next prime is 139857569. The reversal of 139857545 is 545758931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 545758931 = 4441 ⋅122891.

It can be written as a sum of positive squares in 2 ways, for example, as 61340224 + 78517321 = 7832^2 + 8861^2 .

It is a cyclic number.

It is not a de Polignac number, because 139857545 - 2⁶ = 139857481 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 139857545.

It is an unprimeable number.

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, 13985750 + ... + 13985759.

It is an arithmetic number, because the mean of its divisors is an integer number (41957265).

Almost surely, 2^139857545 is an apocalyptic number.

It is an amenable number.

139857545 is a deficient number, since it is larger than the sum of its proper divisors (27971515).

139857545 is an equidigital number, since it uses as much as digits as its factorization.

139857545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27971514.

The product of its digits is 756000, while the sum is 47.

The square root of 139857545 is about 11826.1382116057. The cubic root of 139857545 is about 519.0732321426.

The spelling of 139857545 in words is "one hundred thirty-nine million, eight hundred fifty-seven thousand, five hundred forty-five".