139353887 has 2 divisors, whose sum is σ = 139353888. Its totient is φ = 139353886.

The previous prime is 139353871. The next prime is 139353971. The reversal of 139353887 is 788353931.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 139353887 - 2⁴ = 139353871 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139353817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69676943 + 69676944.

It is an arithmetic number, because the mean of its divisors is an integer number (69676944).

Almost surely, 2^139353887 is an apocalyptic number.

139353887 is a deficient number, since it is larger than the sum of its proper divisors (1).

139353887 is an equidigital number, since it uses as much as digits as its factorization.

139353887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 544320, while the sum is 47.

The square root of 139353887 is about 11804.8247339806. The cubic root of 139353887 is about 518.4493834394.

The spelling of 139353887 in words is "one hundred thirty-nine million, three hundred fifty-three thousand, eight hundred eighty-seven".