138487967 has 8 divisors (see below), whose sum is σ = 148147776. Its totient is φ = 128996352.

The previous prime is 138487961. The next prime is 138487997. The reversal of 138487967 is 769784831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 138487967 - 2¹² = 138483871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138487961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40343 + ... + 43640.

It is an arithmetic number, because the mean of its divisors is an integer number (18518472).

Almost surely, 2^138487967 is an apocalyptic number.

138487967 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

138487967 is a deficient number, since it is larger than the sum of its proper divisors (9659809).

138487967 is an equidigital number, since it uses as much as digits as its factorization.

138487967 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84097.

The product of its digits is 2032128, while the sum is 53.

The square root of 138487967 is about 11768.0910516532. The cubic root of 138487967 is about 517.3733010716.

The spelling of 138487967 in words is "one hundred thirty-eight million, four hundred eighty-seven thousand, nine hundred sixty-seven".