138029477 has 8 divisors (see below), whose sum is σ = 147792600. Its totient is φ = 128449024.

The previous prime is 138029449. The next prime is 138029483. The reversal of 138029477 is 774920831.

It can be written as a sum of positive squares in 4 ways, for example, as 64224196 + 73805281 = 8014^2 + 8591^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 138029477 - 2²⁰ = 136980901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138029407) 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, 44102 + ... + 47127.

It is an arithmetic number, because the mean of its divisors is an integer number (18474075).

Almost surely, 2^138029477 is an apocalyptic number.

138029477 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

138029477 is a deficient number, since it is larger than the sum of its proper divisors (9763123).

138029477 is an equidigital number, since it uses as much as digits as its factorization.

138029477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91335.

The product of its (nonzero) digits is 84672, while the sum is 41.

The square root of 138029477 is about 11748.5946819183. The cubic root of 138029477 is about 516.8017165293.

The spelling of 138029477 in words is "one hundred thirty-eight million, twenty-nine thousand, four hundred seventy-seven".