139433447 has 2 divisors, whose sum is σ = 139433448. Its totient is φ = 139433446.

The previous prime is 139433377. The next prime is 139433453. The reversal of 139433447 is 744334931.

It is a strong prime.

It is an emirp because it is prime and its reverse (744334931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 139433447 - 2¹⁴ = 139417063 is a prime.

It is a super-2 number, since 2×139433447² = 38883372284603618, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 139433447.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139433747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69716723 + 69716724.

It is an arithmetic number, because the mean of its divisors is an integer number (69716724).

Almost surely, 2^139433447 is an apocalyptic number.

139433447 is a deficient number, since it is larger than the sum of its proper divisors (1).

139433447 is an equidigital number, since it uses as much as digits as its factorization.

139433447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 38.

The square root of 139433447 is about 11808.1940617522. The cubic root of 139433447 is about 518.5480291406.

The spelling of 139433447 in words is "one hundred thirty-nine million, four hundred thirty-three thousand, four hundred forty-seven".