138178829 has 4 divisors (see below), whose sum is σ = 138782460. Its totient is φ = 137575200.

The previous prime is 138178813. The next prime is 138178841. The reversal of 138178829 is 928871831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 928871831 = 4621 ⋅201011.

It can be written as a sum of positive squares in 2 ways, for example, as 133864900 + 4313929 = 11570^2 + 2077^2 .

It is a cyclic number.

It is not a de Polignac number, because 138178829 - 2⁴ = 138178813 is a prime.

It is a super-2 number, since 2×138178829² = 38186777567622482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138178529) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 301472 + ... + 301929.

It is an arithmetic number, because the mean of its divisors is an integer number (34695615).

Almost surely, 2^138178829 is an apocalyptic number.

It is an amenable number.

138178829 is a deficient number, since it is larger than the sum of its proper divisors (603631).

138178829 is an equidigital number, since it uses as much as digits as its factorization.

138178829 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 603630.

The product of its digits is 193536, while the sum is 47.

The square root of 138178829 is about 11754.9491279205. The cubic root of 138178829 is about 516.9880476169.

The spelling of 138178829 in words is "one hundred thirty-eight million, one hundred seventy-eight thousand, eight hundred twenty-nine".