138244473 has 12 divisors (see below), whose sum is σ = 200842980. Its totient is φ = 91629216.

The previous prime is 138244471. The next prime is 138244481. The reversal of 138244473 is 374442831.

It can be written as a sum of positive squares in 2 ways, for example, as 126630009 + 11614464 = 11253^2 + 3408^2 .

It is not a de Polignac number, because 138244473 - 2¹ = 138244471 is a prime.

It is a super-2 number, since 2×138244473² = 38223068630095458, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (138244471) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42838 + ... + 45951.

It is an arithmetic number, because the mean of its divisors is an integer number (16736915).

Almost surely, 2^138244473 is an apocalyptic number.

It is an amenable number.

138244473 is a deficient number, since it is larger than the sum of its proper divisors (62598507).

138244473 is a wasteful number, since it uses less digits than its factorization.

138244473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88968 (or 88965 counting only the distinct ones).

The product of its digits is 64512, while the sum is 36.

The square root of 138244473 is about 11757.7409820084. The cubic root of 138244473 is about 517.0699023915.

The spelling of 138244473 in words is "one hundred thirty-eight million, two hundred forty-four thousand, four hundred seventy-three".