138878153 has 4 divisors (see below), whose sum is σ = 141232080. Its totient is φ = 136524228.

The previous prime is 138878137. The next prime is 138878161. The reversal of 138878153 is 351878831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 138878153 - 2⁴ = 138878137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138871153) 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, 1176875 + ... + 1176992.

It is an arithmetic number, because the mean of its divisors is an integer number (35308020).

Almost surely, 2^138878153 is an apocalyptic number.

It is an amenable number.

138878153 is a deficient number, since it is larger than the sum of its proper divisors (2353927).

138878153 is an equidigital number, since it uses as much as digits as its factorization.

138878153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2353926.

The product of its digits is 161280, while the sum is 44.

The square root of 138878153 is about 11784.6575257833. The cubic root of 138878153 is about 517.8587404206.

The spelling of 138878153 in words is "one hundred thirty-eight million, eight hundred seventy-eight thousand, one hundred fifty-three".