139905749 has 2 divisors, whose sum is σ = 139905750. Its totient is φ = 139905748.

The previous prime is 139905739. The next prime is 139905809. The reversal of 139905749 is 947509931.

139905749 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 112678225 + 27227524 = 10615^2 + 5218^2 .

It is a cyclic number.

It is not a de Polignac number, because 139905749 - 2¹⁶ = 139840213 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139905739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69952874 + 69952875.

It is an arithmetic number, because the mean of its divisors is an integer number (69952875).

Almost surely, 2^139905749 is an apocalyptic number.

It is an amenable number.

139905749 is a deficient number, since it is larger than the sum of its proper divisors (1).

139905749 is an equidigital number, since it uses as much as digits as its factorization.

139905749 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 306180, while the sum is 47.

The square root of 139905749 is about 11828.1760639585. The cubic root of 139905749 is about 519.1328607501.

The spelling of 139905749 in words is "one hundred thirty-nine million, nine hundred five thousand, seven hundred forty-nine".