138169499 has 18 divisors (see below), whose sum is σ = 152690076. Its totient is φ = 124965360.

The previous prime is 138169469. The next prime is 138169517. The reversal of 138169499 is 994961831.

It is not a de Polignac number, because 138169499 - 2⁸ = 138169243 is a prime.

It is a super-2 number, since 2×138169499² = 38181620907822002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138169459) by changing a digit.

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 17 ways as a sum of consecutive naturals, for example, 1054664 + ... + 1054794.

It is an arithmetic number, because the mean of its divisors is an integer number (8482782).

Almost surely, 2^138169499 is an apocalyptic number.

138169499 is a deficient number, since it is larger than the sum of its proper divisors (14520577).

138169499 is an equidigital number, since it uses as much as digits as its factorization.

138169499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315 (or 223 counting only the distinct ones).

The product of its digits is 419904, while the sum is 50.

The square root of 138169499 is about 11754.5522671006. The cubic root of 138169499 is about 516.9764114710.

The spelling of 138169499 in words is "one hundred thirty-eight million, one hundred sixty-nine thousand, four hundred ninety-nine".