138700944 has 80 divisors (see below), whose sum is σ = 411005440. Its totient is φ = 44737920.

The previous prime is 138700937. The next prime is 138700951. The reversal of 138700944 is 449007831.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (138700937) and next prime (138700951).

It is a super-2 number, since 2×138700944² = 38475903732982272, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 138700899 and 138700908.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8214 + ... + 18570.

It is an arithmetic number, because the mean of its divisors is an integer number (5137568).

Almost surely, 2^138700944 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 138700944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (205502720).

138700944 is an abundant number, since it is smaller than the sum of its proper divisors (272304496).

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

138700944 is a wasteful number, since it uses less digits than its factorization.

138700944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10405 (or 10393 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 138700944 is about 11777.1364940719. The cubic root of 138700944 is about 517.6383834918.

The spelling of 138700944 in words is "one hundred thirty-eight million, seven hundred thousand, nine hundred forty-four".