139855843 has 2 divisors, whose sum is σ = 139855844. Its totient is φ = 139855842.

The previous prime is 139855841. The next prime is 139855853. The reversal of 139855843 is 348558931.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 139855843 - 2¹ = 139855841 is a prime.

Together with 139855841, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 139855793 and 139855802.

It is not a weakly prime, because it can be changed into another prime (139855841) 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, 69927921 + 69927922.

It is an arithmetic number, because the mean of its divisors is an integer number (69927922).

Almost surely, 2^139855843 is an apocalyptic number.

139855843 is a deficient number, since it is larger than the sum of its proper divisors (1).

139855843 is an equidigital number, since it uses as much as digits as its factorization.

139855843 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 518400, while the sum is 46.

The square root of 139855843 is about 11826.0662521398. The cubic root of 139855843 is about 519.0711265090.

The spelling of 139855843 in words is "one hundred thirty-nine million, eight hundred fifty-five thousand, eight hundred forty-three".