139804477 has 2 divisors, whose sum is σ = 139804478. Its totient is φ = 139804476.

The previous prime is 139804459. The next prime is 139804499. The reversal of 139804477 is 774408931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 134073241 + 5731236 = 11579^2 + 2394^2 .

It is an emirp because it is prime and its reverse (774408931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 139804477 - 2⁷ = 139804349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139804177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69902238 + 69902239.

It is an arithmetic number, because the mean of its divisors is an integer number (69902239).

Almost surely, 2^139804477 is an apocalyptic number.

It is an amenable number.

139804477 is a deficient number, since it is larger than the sum of its proper divisors (1).

139804477 is an equidigital number, since it uses as much as digits as its factorization.

139804477 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 169344, while the sum is 43.

The square root of 139804477 is about 11823.8943246293. The cubic root of 139804477 is about 519.0075708940.

The spelling of 139804477 in words is "one hundred thirty-nine million, eight hundred four thousand, four hundred seventy-seven".