38711440 has 40 divisors (see below), whose sum is σ = 91032120. Its totient is φ = 15307776.

The previous prime is 38711437. The next prime is 38711447. The reversal of 38711440 is 4411783.

It can be written as a sum of positive squares in 4 ways, for example, as 1354896 + 37356544 = 1164^2 + 6112^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 38711399 and 38711408.

It is not an unprimeable number, because it can be changed into a prime (38711447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4402 + ... + 9838.

It is an arithmetic number, because the mean of its divisors is an integer number (2275803).

Almost surely, 2^38711440 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 38711440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45516060).

38711440 is an abundant number, since it is smaller than the sum of its proper divisors (52320680).

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

38711440 is a wasteful number, since it uses less digits than its factorization.

38711440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5539 (or 5533 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 38711440 is about 6221.8518143717. The cubic root of 38711440 is about 338.2826901046.

The spelling of 38711440 in words is "thirty-eight million, seven hundred eleven thousand, four hundred forty".