139909769 has 2 divisors, whose sum is σ = 139909770. Its totient is φ = 139909768.

The previous prime is 139909751. The next prime is 139909799. The reversal of 139909769 is 967909931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81234169 + 58675600 = 9013^2 + 7660^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139909769 is a prime.

It is a super-2 number, since 2×139909769² = 39149486923266722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 139909769.

It is not a weakly prime, because it can be changed into another prime (139909729) 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 as a sum of consecutive naturals, namely, 69954884 + 69954885.

It is an arithmetic number, because the mean of its divisors is an integer number (69954885).

Almost surely, 2^139909769 is an apocalyptic number.

It is an amenable number.

139909769 is a deficient number, since it is larger than the sum of its proper divisors (1).

139909769 is an equidigital number, since it uses as much as digits as its factorization.

139909769 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 826686, while the sum is 53.

The square root of 139909769 is about 11828.3459959540. The cubic root of 139909769 is about 519.1378328930.

The spelling of 139909769 in words is "one hundred thirty-nine million, nine hundred nine thousand, seven hundred sixty-nine".