139785739 has 2 divisors, whose sum is σ = 139785740. Its totient is φ = 139785738.

The previous prime is 139785721. The next prime is 139785749. The reversal of 139785739 is 937587931.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 139785739 - 2⁹ = 139785227 is a prime.

It is a super-2 number, since 2×139785739² = 39080105655552242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (139785749) 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, 69892869 + 69892870.

It is an arithmetic number, because the mean of its divisors is an integer number (69892870).

Almost surely, 2^139785739 is an apocalyptic number.

139785739 is a deficient number, since it is larger than the sum of its proper divisors (1).

139785739 is an equidigital number, since it uses as much as digits as its factorization.

139785739 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1428840, while the sum is 52.

The square root of 139785739 is about 11823.1019195472. The cubic root of 139785739 is about 518.9843823224.

The spelling of 139785739 in words is "one hundred thirty-nine million, seven hundred eighty-five thousand, seven hundred thirty-nine".