38556840 has 128 divisors (see below), whose sum is σ = 133436160. Its totient is φ = 8730624.

The previous prime is 38556827. The next prime is 38556841. The reversal of 38556840 is 4865583.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (38556841) 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, 165364 + ... + 165596.

It is an arithmetic number, because the mean of its divisors is an integer number (1042470).

Almost surely, 2^38556840 is an apocalyptic number.

38556840 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 38556840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (66718080).

38556840 is an abundant number, since it is smaller than the sum of its proper divisors (94879320).

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

38556840 is a wasteful number, since it uses less digits than its factorization.

38556840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 451 (or 447 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 39.

The square root of 38556840 is about 6209.4154314235. The cubic root of 38556840 is about 337.8317615639.

The spelling of 38556840 in words is "thirty-eight million, five hundred fifty-six thousand, eight hundred forty".