38940640 has 48 divisors (see below), whose sum is σ = 92452752. Its totient is φ = 15499264.

The previous prime is 38940607. The next prime is 38940641. The reversal of 38940640 is 4604983.

It is a junction number, because it is equal to n+sod(n) for n = 38940596 and 38940605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38940641) 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, 40647 + ... + 41593.

It is an arithmetic number, because the mean of its divisors is an integer number (1926099).

Almost surely, 2^38940640 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 38940640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46226376).

38940640 is an abundant number, since it is smaller than the sum of its proper divisors (53512112).

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

38940640 is a wasteful number, since it uses less digits than its factorization.

38940640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1219 (or 1211 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 38940640 is about 6240.2435849893. The cubic root of 38940640 is about 338.9490036788.

The spelling of 38940640 in words is "thirty-eight million, nine hundred forty thousand, six hundred forty".