138111478 has 8 divisors (see below), whose sum is σ = 207217080. Its totient is φ = 69039120.

The previous prime is 138111473. The next prime is 138111497. The reversal of 138111478 is 874111831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×138111478³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138111473) 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, 12418 + ... + 20746.

It is an arithmetic number, because the mean of its divisors is an integer number (25902135).

Almost surely, 2^138111478 is an apocalyptic number.

138111478 is a deficient number, since it is larger than the sum of its proper divisors (69105602).

138111478 is an equidigital number, since it uses as much as digits as its factorization.

138111478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16622.

The product of its digits is 5376, while the sum is 34.

The square root of 138111478 is about 11752.0839854045. The cubic root of 138111478 is about 516.9040373503.

The spelling of 138111478 in words is "one hundred thirty-eight million, one hundred eleven thousand, four hundred seventy-eight".