138370056 has 64 divisors (see below), whose sum is σ = 380436480. Its totient is φ = 41590080.

The previous prime is 138370051. The next prime is 138370061. The reversal of 138370056 is 650073831.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (138370051) and next prime (138370061).

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 138369999 and 138370026.

It is not an unprimeable number, because it can be changed into a prime (138370051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31465 + ... + 35591.

It is an arithmetic number, because the mean of its divisors is an integer number (5944320).

Almost surely, 2^138370056 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138370056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (190218240).

138370056 is an abundant number, since it is smaller than the sum of its proper divisors (242066424).

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

138370056 is a wasteful number, since it uses less digits than its factorization.

138370056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4274 (or 4270 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 33.

The square root of 138370056 is about 11763.0802088569. The cubic root of 138370056 is about 517.2264259168.

The spelling of 138370056 in words is "one hundred thirty-eight million, three hundred seventy thousand, fifty-six".