139804459 has 2 divisors, whose sum is σ = 139804460. Its totient is φ = 139804458.

The previous prime is 139804439. The next prime is 139804477. The reversal of 139804459 is 954408931.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 139804459 - 2¹⁵ = 139771691 is a prime.

It is not a weakly prime, because it can be changed into another prime (139804429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69902229 + 69902230.

It is an arithmetic number, because the mean of its divisors is an integer number (69902230).

Almost surely, 2^139804459 is an apocalyptic number.

139804459 is a deficient number, since it is larger than the sum of its proper divisors (1).

139804459 is an equidigital number, since it uses as much as digits as its factorization.

139804459 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 155520, while the sum is 43.

The square root of 139804459 is about 11823.8935634587. The cubic root of 139804459 is about 519.0075486197.

The spelling of 139804459 in words is "one hundred thirty-nine million, eight hundred four thousand, four hundred fifty-nine".