138942466 has 8 divisors (see below), whose sum is σ = 224445564. Its totient is φ = 64127280.

The previous prime is 138942449. The next prime is 138942467. The reversal of 138942466 is 664249831.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 97713225 + 41229241 = 9885^2 + 6421^2 .

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

It is a super-2 number, since 2×138942466² = 38610017716322312, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (138942467) 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, 2671945 + ... + 2671996.

Almost surely, 2^138942466 is an apocalyptic number.

138942466 is a deficient number, since it is larger than the sum of its proper divisors (85503098).

138942466 is a wasteful number, since it uses less digits than its factorization.

138942466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5343956.

The product of its digits is 248832, while the sum is 43.

The square root of 138942466 is about 11787.3858849195. The cubic root of 138942466 is about 517.9386663814.

The spelling of 138942466 in words is "one hundred thirty-eight million, nine hundred forty-two thousand, four hundred sixty-six".