138171465 has 24 divisors (see below), whose sum is σ = 249912000. Its totient is φ = 70486944.

The previous prime is 138171413. The next prime is 138171491. The reversal of 138171465 is 564171831.

It is not a de Polignac number, because 138171465 - 2⁷ = 138171337 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 65715 + ... + 67784.

It is an arithmetic number, because the mean of its divisors is an integer number (10413000).

Almost surely, 2^138171465 is an apocalyptic number.

138171465 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138171465 is a deficient number, since it is larger than the sum of its proper divisors (111740535).

138171465 is a wasteful number, since it uses less digits than its factorization.

138171465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133533 (or 133530 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 138171465 is about 11754.6358939782. The cubic root of 138171465 is about 516.9788634613.

The spelling of 138171465 in words is "one hundred thirty-eight million, one hundred seventy-one thousand, four hundred sixty-five".