138438963 has 40 divisors (see below), whose sum is σ = 229950336. Its totient is φ = 82425600.

The previous prime is 138438943. The next prime is 138438977. The reversal of 138438963 is 369834831.

It is not a de Polignac number, because 138438963 - 2⁵ = 138438931 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138438913) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 30523 + ... + 34763.

Almost surely, 2^138438963 is an apocalyptic number.

138438963 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

138438963 is a deficient number, since it is larger than the sum of its proper divisors (91511373).

138438963 is a wasteful number, since it uses less digits than its factorization.

138438963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4297 (or 4288 counting only the distinct ones).

The product of its digits is 373248, while the sum is 45.

The square root of 138438963 is about 11766.0087965291. The cubic root of 138438963 is about 517.3122696506.

The spelling of 138438963 in words is "one hundred thirty-eight million, four hundred thirty-eight thousand, nine hundred sixty-three".