139688401 has 2 divisors, whose sum is σ = 139688402. Its totient is φ = 139688400.

The previous prime is 139688321. The next prime is 139688491. The reversal of 139688401 is 104886931.

139688401 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 100300225 + 39388176 = 10015^2 + 6276^2 .

It is an emirp because it is prime and its reverse (104886931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 139688401 - 2¹³ = 139680209 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (139688491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69844200 + 69844201.

It is an arithmetic number, because the mean of its divisors is an integer number (69844201).

Almost surely, 2^139688401 is an apocalyptic number.

It is an amenable number.

139688401 is a deficient number, since it is larger than the sum of its proper divisors (1).

139688401 is an equidigital number, since it uses as much as digits as its factorization.

139688401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 40.

The square root of 139688401 is about 11818.9847702753. The cubic root of 139688401 is about 518.8638916526.

The spelling of 139688401 in words is "one hundred thirty-nine million, six hundred eighty-eight thousand, four hundred one".