138418246 has 4 divisors (see below), whose sum is σ = 207627372. Its totient is φ = 69209122.

The previous prime is 138418219. The next prime is 138418289. The reversal of 138418246 is 642814831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 642814831 = 83 ⋅7744757.

It is a super-2 number, since 2×138418246² = 38319221651433032, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34604560 + ... + 34604563.

It is an arithmetic number, because the mean of its divisors is an integer number (51906843).

Almost surely, 2^138418246 is an apocalyptic number.

138418246 is a deficient number, since it is larger than the sum of its proper divisors (69209126).

138418246 is an equidigital number, since it uses as much as digits as its factorization.

138418246 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69209125.

The product of its digits is 36864, while the sum is 37.

The square root of 138418246 is about 11765.1283885897. The cubic root of 138418246 is about 517.2864635897.

The spelling of 138418246 in words is "one hundred thirty-eight million, four hundred eighteen thousand, two hundred forty-six".