38783940 has 96 divisors (see below), whose sum is σ = 123150720. Its totient is φ = 9040896.

The previous prime is 38783939. The next prime is 38783947. The reversal of 38783940 is 4938783.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 38783892 and 38783901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38783947) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13512 + ... + 16128.

It is an arithmetic number, because the mean of its divisors is an integer number (1282820).

Almost surely, 2^38783940 is an apocalyptic number.

38783940 is a gapful number since it is divisible by the number (30) 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 38783940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (61575360).

38783940 is an abundant number, since it is smaller than the sum of its proper divisors (84366780).

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

38783940 is a wasteful number, since it uses less digits than its factorization.

38783940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2661 (or 2659 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 42.

The square root of 38783940 is about 6227.6753287242. The cubic root of 38783940 is about 338.4937405523.

The spelling of 38783940 in words is "thirty-eight million, seven hundred eighty-three thousand, nine hundred forty".