38021840 has 20 divisors (see below), whose sum is σ = 88400964. Its totient is φ = 15208704.

The previous prime is 38021821. The next prime is 38021857. The reversal of 38021840 is 4812083.

It can be written as a sum of positive squares in 2 ways, for example, as 7639696 + 30382144 = 2764^2 + 5512^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 237557 + ... + 237716.

Almost surely, 2^38021840 is an apocalyptic number.

It is an amenable number.

38021840 is an abundant number, since it is smaller than the sum of its proper divisors (50379124).

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

38021840 is a wasteful number, since it uses less digits than its factorization.

38021840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 475286 (or 475280 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 38021840 is about 6166.1852064303. The cubic root of 38021840 is about 336.2619367155.

The spelling of 38021840 in words is "thirty-eight million, twenty-one thousand, eight hundred forty".