138031040 has 84 divisors (see below), whose sum is σ = 382392936. Its totient is φ = 47319552.

The previous prime is 138031037. The next prime is 138031081. The reversal of 138031040 is 40130831.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11279 + ... + 20081.

Almost surely, 2^138031040 is an apocalyptic number.

138031040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138031040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (191196468).

138031040 is an abundant number, since it is smaller than the sum of its proper divisors (244361896).

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

138031040 is an equidigital number, since it uses as much as digits as its factorization.

138031040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8834 (or 8817 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 138031040 is about 11748.6612003241. The cubic root of 138031040 is about 516.8036672189.

Adding to 138031040 its reverse (40130831), we get a palindrome (178161871).

The spelling of 138031040 in words is "one hundred thirty-eight million, thirty-one thousand, forty".