139781843 has 2 divisors, whose sum is σ = 139781844. Its totient is φ = 139781842.

The previous prime is 139781813. The next prime is 139781849. The reversal of 139781843 is 348187931.

139781843 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 139781843 - 2¹⁴ = 139765459 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 139781794 and 139781803.

It is not a weakly prime, because it can be changed into another prime (139781849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69890921 + 69890922.

It is an arithmetic number, because the mean of its divisors is an integer number (69890922).

Almost surely, 2^139781843 is an apocalyptic number.

139781843 is a deficient number, since it is larger than the sum of its proper divisors (1).

139781843 is an equidigital number, since it uses as much as digits as its factorization.

139781843 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 44.

The square root of 139781843 is about 11822.9371562231. The cubic root of 139781843 is about 518.9795607005.

The spelling of 139781843 in words is "one hundred thirty-nine million, seven hundred eighty-one thousand, eight hundred forty-three".