38240640 has 128 divisors (see below), whose sum is σ = 135496800. Its totient is φ = 10192896.

The previous prime is 38240611. The next prime is 38240663. The reversal of 38240640 is 4604283.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16174 + ... + 18386.

Almost surely, 2^38240640 is an apocalyptic number.

38240640 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 38240640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67748400).

38240640 is an abundant number, since it is smaller than the sum of its proper divisors (97256160).

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

38240640 is a wasteful number, since it uses less digits than its factorization.

38240640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2241 (or 2223 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 38240640 is about 6183.9016809778. The cubic root of 38240640 is about 336.9057196191.

The spelling of 38240640 in words is "thirty-eight million, two hundred forty thousand, six hundred forty".