139705245 has 24 divisors (see below), whose sum is σ = 248065272. Its totient is φ = 72691200.

The previous prime is 139705219. The next prime is 139705249. The reversal of 139705245 is 542507931.

It can be written as a sum of positive squares in 4 ways, for example, as 14220441 + 125484804 = 3771^2 + 11202^2 .

It is not a de Polignac number, because 139705245 - 2⁸ = 139704989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139705249) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 36016 + ... + 39705.

It is an arithmetic number, because the mean of its divisors is an integer number (10336053).

Almost surely, 2^139705245 is an apocalyptic number.

139705245 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

139705245 is a deficient number, since it is larger than the sum of its proper divisors (108360027).

139705245 is a wasteful number, since it uses less digits than its factorization.

139705245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75773 (or 75770 counting only the distinct ones).

The product of its (nonzero) digits is 37800, while the sum is 36.

The square root of 139705245 is about 11819.6973311502. The cubic root of 139705245 is about 518.8847461451.

The spelling of 139705245 in words is "one hundred thirty-nine million, seven hundred five thousand, two hundred forty-five".