139192645 has 12 divisors (see below), whose sum is σ = 168763140. Its totient is φ = 110211200.

The previous prime is 139192639. The next prime is 139192649. The reversal of 139192645 is 546291931.

It can be written as a sum of positive squares in 6 ways, for example, as 73290721 + 65901924 = 8561^2 + 8118^2 .

It is not a de Polignac number, because 139192645 - 2⁹ = 139192133 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 139192598 and 139192607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139192649) 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 11 ways as a sum of consecutive naturals, for example, 49641 + ... + 52369.

It is an arithmetic number, because the mean of its divisors is an integer number (14063595).

Almost surely, 2^139192645 is an apocalyptic number.

It is an amenable number.

139192645 is a deficient number, since it is larger than the sum of its proper divisors (29570495).

139192645 is an equidigital number, since it uses as much as digits as its factorization.

139192645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2936 (or 2835 counting only the distinct ones).

The product of its digits is 58320, while the sum is 40.

The square root of 139192645 is about 11797.9932615678. The cubic root of 139192645 is about 518.2493457750.

The spelling of 139192645 in words is "one hundred thirty-nine million, one hundred ninety-two thousand, six hundred forty-five".