139809797 has 2 divisors, whose sum is σ = 139809798. Its totient is φ = 139809796.

The previous prime is 139809773. The next prime is 139809821. The reversal of 139809797 is 797908931.

It is a balanced prime because it is at equal distance from previous prime (139809773) and next prime (139809821).

It can be written as a sum of positive squares in only one way, i.e., 99880036 + 39929761 = 9994^2 + 6319^2 .

It is a cyclic number.

It is not a de Polignac number, because 139809797 - 2²⁶ = 72700933 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 (139809757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69904898 + 69904899.

It is an arithmetic number, because the mean of its divisors is an integer number (69904899).

Almost surely, 2^139809797 is an apocalyptic number.

It is an amenable number.

139809797 is a deficient number, since it is larger than the sum of its proper divisors (1).

139809797 is an equidigital number, since it uses as much as digits as its factorization.

139809797 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 857304, while the sum is 53.

The square root of 139809797 is about 11824.1192906702. The cubic root of 139809797 is about 519.0141541006.

The spelling of 139809797 in words is "one hundred thirty-nine million, eight hundred nine thousand, seven hundred ninety-seven".