138333777 has 8 divisors (see below), whose sum is σ = 195294816. Its totient is φ = 86797632.

The previous prime is 138333721. The next prime is 138333779. The reversal of 138333777 is 777333831.

138333777 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 138333777 - 2²³ = 129945169 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138333779) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1356163 + ... + 1356264.

It is an arithmetic number, because the mean of its divisors is an integer number (24411852).

Almost surely, 2^138333777 is an apocalyptic number.

138333777 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

138333777 is a deficient number, since it is larger than the sum of its proper divisors (56961039).

138333777 is a wasteful number, since it uses less digits than its factorization.

138333777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2712447.

The product of its digits is 222264, while the sum is 42.

The square root of 138333777 is about 11761.5380371786. The cubic root of 138333777 is about 517.1812184053.

The spelling of 138333777 in words is "one hundred thirty-eight million, three hundred thirty-three thousand, seven hundred seventy-seven".