138199446 has 112 divisors (see below), whose sum is σ = 387813888. Its totient is φ = 35866800.

The previous prime is 138199429. The next prime is 138199447. The reversal of 138199446 is 644991831.

138199446 is a `hidden beast` number, since 13 + 8 + 199 + 446 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138199447) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 111651 + ... + 112881.

It is an arithmetic number, because the mean of its divisors is an integer number (3462624).

Almost surely, 2^138199446 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138199446, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (193906944).

138199446 is an abundant number, since it is smaller than the sum of its proper divisors (249614442).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138199446 is a wasteful number, since it uses less digits than its factorization.

138199446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1269 (or 1254 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 138199446 is about 11755.8260449872. The cubic root of 138199446 is about 517.0137587734.

The spelling of 138199446 in words is "one hundred thirty-eight million, one hundred ninety-nine thousand, four hundred forty-six".