138478916 has 12 divisors (see below), whose sum is σ = 255092880. Its totient is φ = 65595240.

The previous prime is 138478913. The next prime is 138478919. The reversal of 138478916 is 619874831.

It is an interprime number because it is at equal distance from previous prime (138478913) and next prime (138478919).

It is not an unprimeable number, because it can be changed into a prime (138478913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 910970 + ... + 911121.

It is an arithmetic number, because the mean of its divisors is an integer number (21257740).

Almost surely, 2^138478916 is an apocalyptic number.

It is an amenable number.

138478916 is a deficient number, since it is larger than the sum of its proper divisors (116613964).

138478916 is a wasteful number, since it uses less digits than its factorization.

138478916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1822114 (or 1822112 counting only the distinct ones).

The product of its digits is 290304, while the sum is 47.

The square root of 138478916 is about 11767.7064885219. The cubic root of 138478916 is about 517.3620297006.

The spelling of 138478916 in words is "one hundred thirty-eight million, four hundred seventy-eight thousand, nine hundred sixteen".