38691980 has 72 divisors (see below), whose sum is σ = 89867232. Its totient is φ = 13964544.

The previous prime is 38691979. The next prime is 38691997. The reversal of 38691980 is 8919683.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 165944 + ... + 166176.

It is an arithmetic number, because the mean of its divisors is an integer number (1248156).

Almost surely, 2^38691980 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 38691980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44933616).

38691980 is an abundant number, since it is smaller than the sum of its proper divisors (51175252).

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

38691980 is a wasteful number, since it uses less digits than its factorization.

38691980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303 (or 282 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 38691980 is about 6220.2877746934. The cubic root of 38691980 is about 338.2259964026.

The spelling of 38691980 in words is "thirty-eight million, six hundred ninety-one thousand, nine hundred eighty".