139193843 has 2 divisors, whose sum is σ = 139193844. Its totient is φ = 139193842.

The previous prime is 139193809. The next prime is 139193849. The reversal of 139193843 is 348391931.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 139193843 - 2¹⁰ = 139192819 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 139193843.

It is not a weakly prime, because it can be changed into another prime (139193849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69596921 + 69596922.

It is an arithmetic number, because the mean of its divisors is an integer number (69596922).

Almost surely, 2^139193843 is an apocalyptic number.

139193843 is a deficient number, since it is larger than the sum of its proper divisors (1).

139193843 is an equidigital number, since it uses as much as digits as its factorization.

139193843 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69984, while the sum is 41.

The square root of 139193843 is about 11798.0440328048. The cubic root of 139193843 is about 518.2508325895.

The spelling of 139193843 in words is "one hundred thirty-nine million, one hundred ninety-three thousand, eight hundred forty-three".