139864349 has 2 divisors, whose sum is σ = 139864350. Its totient is φ = 139864348.

The previous prime is 139864273. The next prime is 139864367. The reversal of 139864349 is 943468931.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 133564249 + 6300100 = 11557^2 + 2510^2 .

It is an emirp because it is prime and its reverse (943468931) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139864349 is a prime.

It is a super-2 number, since 2×139864349² = 39124072242387602, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139864369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69932174 + 69932175.

It is an arithmetic number, because the mean of its divisors is an integer number (69932175).

Almost surely, 2^139864349 is an apocalyptic number.

It is an amenable number.

139864349 is a deficient number, since it is larger than the sum of its proper divisors (1).

139864349 is an equidigital number, since it uses as much as digits as its factorization.

139864349 is an evil number, because the sum of its binary digits is even.

The product of its digits is 559872, while the sum is 47.

The square root of 139864349 is about 11826.4258759779. The cubic root of 139864349 is about 519.0816495576.

The spelling of 139864349 in words is "one hundred thirty-nine million, eight hundred sixty-four thousand, three hundred forty-nine".