138477967 has 4 divisors (see below), whose sum is σ = 138827176. Its totient is φ = 138128760.

The previous prime is 138477959. The next prime is 138478003. The reversal of 138477967 is 769774831.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 138477967 - 2³ = 138477959 is a prime.

It is a super-2 number, since 2×138477967² = 38352294688906178, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138477907) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 174009 + ... + 174802.

It is an arithmetic number, because the mean of its divisors is an integer number (34706794).

Almost surely, 2^138477967 is an apocalyptic number.

138477967 is a deficient number, since it is larger than the sum of its proper divisors (349209).

138477967 is an equidigital number, since it uses as much as digits as its factorization.

138477967 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349208.

The product of its digits is 1778112, while the sum is 52.

The square root of 138477967 is about 11767.6661662370. Note that the first 3 decimals coincide. The cubic root of 138477967 is about 517.3608478656.

The spelling of 138477967 in words is "one hundred thirty-eight million, four hundred seventy-seven thousand, nine hundred sixty-seven".