139795975449 has 27 divisors (see below), whose sum is σ = 218678053503. Its totient is φ = 86019319152.

The previous prime is 139795975439. The next prime is 139795975457. The reversal of 139795975449 is 944579597931.

The square root of 139795975449 is 373893.

It is a perfect power (a square), and thus also a powerful number.

139795975449 is a `hidden beast` number, since 1 + 3 + 9 + 7 + 95 + 97 + 5 + 449 = 666.

It can be written as a sum of positive squares in only one way, i.e., 20679878025 + 119116097424 = 143805^2 + 345132^2 .

It is a de Polignac number, because none of the positive numbers 2^k-139795975449 is a prime.

It is a Smith number, since the sum of its digits (72) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (139795975409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 14577034 + ... + 14586620.

Almost surely, 2^139795975449 is an apocalyptic number.

139795975449 is the 373893-rd square number.

139795975449 is the 186947-th centered octagonal number.

It is an amenable number.

139795975449 is a deficient number, since it is larger than the sum of its proper divisors (78882078054).

139795975449 is an frugal number, since it uses more digits than its factorization.

139795975449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19206 (or 9603 counting only the distinct ones).

The product of its digits is 385786800, while the sum is 72.

The spelling of 139795975449 in words is "one hundred thirty-nine billion, seven hundred ninety-five million, nine hundred seventy-five thousand, four hundred forty-nine".