38138140 has 48 divisors (see below), whose sum is σ = 88506432. Its totient is φ = 13730816.

The previous prime is 38138137. The next prime is 38138141. The reversal of 38138140 is 4183183.

It is a junction number, because it is equal to n+sod(n) for n = 38138099 and 38138108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38138141) 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, 5382 + ... + 10258.

It is an arithmetic number, because the mean of its divisors is an integer number (1843884).

Almost surely, 2^38138140 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 38138140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44253216).

38138140 is an abundant number, since it is smaller than the sum of its proper divisors (50368292).

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

38138140 is a wasteful number, since it uses less digits than its factorization.

38138140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4926 (or 4924 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 38138140 is about 6175.6084720455. The cubic root of 38138140 is about 336.6044368637.

The spelling of 38138140 in words is "thirty-eight million, one hundred thirty-eight thousand, one hundred forty".