138181485 has 32 divisors (see below), whose sum is σ = 240242688. Its totient is φ = 67415040.

The previous prime is 138181397. The next prime is 138181487. The reversal of 138181485 is 584181831.

It is not a de Polignac number, because 138181485 - 2¹⁷ = 138050413 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138181487) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18900 + ... + 25170.

It is an arithmetic number, because the mean of its divisors is an integer number (7507584).

Almost surely, 2^138181485 is an apocalyptic number.

138181485 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138181485 is a deficient number, since it is larger than the sum of its proper divisors (102061203).

138181485 is a wasteful number, since it uses less digits than its factorization.

138181485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6405.

The product of its digits is 30720, while the sum is 39.

The square root of 138181485 is about 11755.0621010695. The cubic root of 138181485 is about 516.9913600188.

The spelling of 138181485 in words is "one hundred thirty-eight million, one hundred eighty-one thousand, four hundred eighty-five".