138534975 has 24 divisors (see below), whose sum is σ = 254495120. Its totient is φ = 73884960.

The previous prime is 138534973. The next prime is 138534983. The reversal of 138534975 is 579435831.

It is not a de Polignac number, because 138534975 - 2¹ = 138534973 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 138534975.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138534973) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 101944 + ... + 103293.

Almost surely, 2^138534975 is an apocalyptic number.

138534975 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

138534975 is a deficient number, since it is larger than the sum of its proper divisors (115960145).

138534975 is a wasteful number, since it uses less digits than its factorization.

138534975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205256 (or 205245 counting only the distinct ones).

The product of its digits is 453600, while the sum is 45.

The square root of 138534975 is about 11770.0881475034. The cubic root of 138534975 is about 517.4318330712.

The spelling of 138534975 in words is "one hundred thirty-eight million, five hundred thirty-four thousand, nine hundred seventy-five".