138004473 has 4 divisors (see below), whose sum is σ = 184005968. Its totient is φ = 92002980.

The previous prime is 138004411. The next prime is 138004507. The reversal of 138004473 is 374400831.

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 not a de Polignac number, because 138004473 - 2⁶ = 138004409 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 138004473.

It is not an unprimeable number, because it can be changed into a prime (138004973) 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, 23000743 + ... + 23000748.

It is an arithmetic number, because the mean of its divisors is an integer number (46001492).

Almost surely, 2^138004473 is an apocalyptic number.

It is an amenable number.

138004473 is a deficient number, since it is larger than the sum of its proper divisors (46001495).

138004473 is an equidigital number, since it uses as much as digits as its factorization.

138004473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46001494.

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 138004473 is about 11747.5305064511. The cubic root of 138004473 is about 516.7705084840.

The spelling of 138004473 in words is "one hundred thirty-eight million, four thousand, four hundred seventy-three".