139908401 has 2 divisors, whose sum is σ = 139908402. Its totient is φ = 139908400.

The previous prime is 139908397. The next prime is 139908413. The reversal of 139908401 is 104809931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 114918400 + 24990001 = 10720^2 + 4999^2 .

It is a cyclic number.

It is not a de Polignac number, because 139908401 - 2² = 139908397 is a prime.

It is not a weakly prime, because it can be changed into another prime (139908421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69954200 + 69954201.

It is an arithmetic number, because the mean of its divisors is an integer number (69954201).

Almost surely, 2^139908401 is an apocalyptic number.

It is an amenable number.

139908401 is a deficient number, since it is larger than the sum of its proper divisors (1).

139908401 is an equidigital number, since it uses as much as digits as its factorization.

139908401 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 35.

The square root of 139908401 is about 11828.2881686236. The cubic root of 139908401 is about 519.1361408909.

The spelling of 139908401 in words is "one hundred thirty-nine million, nine hundred eight thousand, four hundred one".