139404361 has 2 divisors, whose sum is σ = 139404362. Its totient is φ = 139404360.

The previous prime is 139404313. The next prime is 139404373. The reversal of 139404361 is 163404931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85470025 + 53934336 = 9245^2 + 7344^2 .

It is a cyclic number.

It is not a de Polignac number, because 139404361 - 2¹⁷ = 139273289 is a prime.

It is not a weakly prime, because it can be changed into another prime (130404361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69702180 + 69702181.

It is an arithmetic number, because the mean of its divisors is an integer number (69702181).

Almost surely, 2^139404361 is an apocalyptic number.

It is an amenable number.

139404361 is a deficient number, since it is larger than the sum of its proper divisors (1).

139404361 is an equidigital number, since it uses as much as digits as its factorization.

139404361 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 139404361 is about 11806.9623951294. The cubic root of 139404361 is about 518.5119700334.

The spelling of 139404361 in words is "one hundred thirty-nine million, four hundred four thousand, three hundred sixty-one".