138211946 has 8 divisors (see below), whose sum is σ = 212921220. Its totient is φ = 67238208.

The previous prime is 138211939. The next prime is 138211979. The reversal of 138211946 is 649112831.

138211946 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 111534721 + 26677225 = 10561^2 + 5165^2 .

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

It is a super-3 number, since 3×138211946³ (a number of 25 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 933791 + ... + 933938.

Almost surely, 2^138211946 is an apocalyptic number.

138211946 is a deficient number, since it is larger than the sum of its proper divisors (74709274).

138211946 is a wasteful number, since it uses less digits than its factorization.

138211946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1867768.

The product of its digits is 10368, while the sum is 35.

The square root of 138211946 is about 11756.3576842490. The cubic root of 138211946 is about 517.0293460939.

The spelling of 138211946 in words is "one hundred thirty-eight million, two hundred eleven thousand, nine hundred forty-six".