139287773 has 2 divisors, whose sum is σ = 139287774. Its totient is φ = 139287772.

The previous prime is 139287769. The next prime is 139287781. The reversal of 139287773 is 377782931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80964004 + 58323769 = 8998^2 + 7637^2 .

It is a cyclic number.

It is not a de Polignac number, because 139287773 - 2² = 139287769 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139287703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69643886 + 69643887.

It is an arithmetic number, because the mean of its divisors is an integer number (69643887).

Almost surely, 2^139287773 is an apocalyptic number.

It is an amenable number.

139287773 is a deficient number, since it is larger than the sum of its proper divisors (1).

139287773 is an equidigital number, since it uses as much as digits as its factorization.

139287773 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 444528, while the sum is 47.

The square root of 139287773 is about 11802.0241060591. The cubic root of 139287773 is about 518.3673807402.

The spelling of 139287773 in words is "one hundred thirty-nine million, two hundred eighty-seven thousand, seven hundred seventy-three".