138244474 has 4 divisors (see below), whose sum is σ = 207366714. Its totient is φ = 69122236.

The previous prime is 138244471. The next prime is 138244481. The reversal of 138244474 is 474442831.

138244474 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 474442831 = 131 ⋅3621701.

It can be written as a sum of positive squares in only one way, i.e., 86620249 + 51624225 = 9307^2 + 7185^2 .

It is a super-2 number, since 2×138244474² = 38223069183073352, 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 as a sum of consecutive naturals, namely, 34561117 + ... + 34561120.

Almost surely, 2^138244474 is an apocalyptic number.

138244474 is a deficient number, since it is larger than the sum of its proper divisors (69122240).

138244474 is an equidigital number, since it uses as much as digits as its factorization.

138244474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69122239.

The product of its digits is 86016, while the sum is 37.

The square root of 138244474 is about 11757.7410245336. The cubic root of 138244474 is about 517.0699036382.

The spelling of 138244474 in words is "one hundred thirty-eight million, two hundred forty-four thousand, four hundred seventy-four".