139814869 has 2 divisors, whose sum is σ = 139814870. Its totient is φ = 139814868.

The previous prime is 139814849. The next prime is 139814893. The reversal of 139814869 is 968418931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 135140625 + 4674244 = 11625^2 + 2162^2 .

It is an emirp because it is prime and its reverse (968418931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 139814869 - 2²³ = 131426261 is a prime.

It is a super-2 number, since 2×139814869² = 39096395186974322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139814809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69907434 + 69907435.

It is an arithmetic number, because the mean of its divisors is an integer number (69907435).

Almost surely, 2^139814869 is an apocalyptic number.

It is an amenable number.

139814869 is a deficient number, since it is larger than the sum of its proper divisors (1).

139814869 is an equidigital number, since it uses as much as digits as its factorization.

139814869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 373248, while the sum is 49.

The square root of 139814869 is about 11824.3337655870. Note that the first 3 decimals coincide. The cubic root of 139814869 is about 519.0204302653.

The spelling of 139814869 in words is "one hundred thirty-nine million, eight hundred fourteen thousand, eight hundred sixty-nine".