138109455 has 80 divisors (see below), whose sum is σ = 279655200. Its totient is φ = 64592640.

The previous prime is 138109409. The next prime is 138109463. The reversal of 138109455 is 554901831.

It is not a de Polignac number, because 138109455 - 2¹¹ = 138107407 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 128661 + ... + 129729.

It is an arithmetic number, because the mean of its divisors is an integer number (3495690).

Almost surely, 2^138109455 is an apocalyptic number.

138109455 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

138109455 is an abundant number, since it is smaller than the sum of its proper divisors (141545745).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138109455 is a wasteful number, since it uses less digits than its factorization.

138109455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1126 (or 1117 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 36.

The square root of 138109455 is about 11751.9979152483. The cubic root of 138109455 is about 516.9015135389.

The spelling of 138109455 in words is "one hundred thirty-eight million, one hundred nine thousand, four hundred fifty-five".