38991330 has 96 divisors (see below), whose sum is σ = 117936000. Its totient is φ = 8752896.

The previous prime is 38991311. The next prime is 38991343. The reversal of 38991330 is 3319983.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 36646 + ... + 37694.

It is an arithmetic number, because the mean of its divisors is an integer number (1228500).

Almost surely, 2^38991330 is an apocalyptic number.

38991330 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 38991330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (58968000).

38991330 is an abundant number, since it is smaller than the sum of its proper divisors (78944670).

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

38991330 is a wasteful number, since it uses less digits than its factorization.

38991330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1128 (or 1125 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 36.

The square root of 38991330 is about 6244.3038042683. The cubic root of 38991330 is about 339.0960126927.

It can be divided in two parts, 389 and 91330, that added together give a palindrome (91719).

The spelling of 38991330 in words is "thirty-eight million, nine hundred ninety-one thousand, three hundred thirty".