38981840 has 40 divisors (see below), whose sum is σ = 91922688. Its totient is φ = 15370880.

The previous prime is 38981837. The next prime is 38981893. The reversal of 38981840 is 4818983.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2249 + ... + 9111.

Almost surely, 2^38981840 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 38981840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45961344).

38981840 is an abundant number, since it is smaller than the sum of its proper divisors (52940848).

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

38981840 is a wasteful number, since it uses less digits than its factorization.

38981840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6947 (or 6941 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 41.

The square root of 38981840 is about 6243.5438654662. The cubic root of 38981840 is about 339.0684998903.

The spelling of 38981840 in words is "thirty-eight million, nine hundred eighty-one thousand, eight hundred forty".