139198789 has 2 divisors, whose sum is σ = 139198790. Its totient is φ = 139198788.

The previous prime is 139198781. The next prime is 139198793. The reversal of 139198789 is 987891931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 81180100 + 58018689 = 9010^2 + 7617^2 .

It is a cyclic number.

It is not a de Polignac number, because 139198789 - 2³ = 139198781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139198781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69599394 + 69599395.

It is an arithmetic number, because the mean of its divisors is an integer number (69599395).

Almost surely, 2^139198789 is an apocalyptic number.

It is an amenable number.

139198789 is a deficient number, since it is larger than the sum of its proper divisors (1).

139198789 is an equidigital number, since it uses as much as digits as its factorization.

139198789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 979776, while the sum is 55.

The square root of 139198789 is about 11798.2536419591. The cubic root of 139198789 is about 518.2569708836.

The spelling of 139198789 in words is "one hundred thirty-nine million, one hundred ninety-eight thousand, seven hundred eighty-nine".