38943840 has 144 divisors (see below), whose sum is σ = 133802928. Its totient is φ = 9464832.

The previous prime is 38943833. The next prime is 38943881. The reversal of 38943840 is 4834983.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 492921 + ... + 492999.

It is an arithmetic number, because the mean of its divisors is an integer number (929187).

Almost surely, 2^38943840 is an apocalyptic number.

38943840 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a pronic number, being equal to 6240×6241.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 38943840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (66901464).

38943840 is an abundant number, since it is smaller than the sum of its proper divisors (94859088).

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

38943840 is a wasteful number, since it uses less digits than its factorization.

38943840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189 (or 102 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 39.

The square root of 38943840 is about 6240.4999799696. The cubic root of 38943840 is about 338.9582879561.

The spelling of 38943840 in words is "thirty-eight million, nine hundred forty-three thousand, eight hundred forty".