138684967 has 2 divisors, whose sum is σ = 138684968. Its totient is φ = 138684966.

The previous prime is 138684961. The next prime is 138684977. The reversal of 138684967 is 769486831.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (769486831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138684967 - 2⁷ = 138684839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138684961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69342483 + 69342484.

It is an arithmetic number, because the mean of its divisors is an integer number (69342484).

Almost surely, 2^138684967 is an apocalyptic number.

138684967 is a deficient number, since it is larger than the sum of its proper divisors (1).

138684967 is an equidigital number, since it uses as much as digits as its factorization.

138684967 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1741824, while the sum is 52.

The square root of 138684967 is about 11776.4581687365. The cubic root of 138684967 is about 517.6185070925.

The spelling of 138684967 in words is "one hundred thirty-eight million, six hundred eighty-four thousand, nine hundred sixty-seven".