38421820 has 48 divisors (see below), whose sum is σ = 83589408. Its totient is φ = 14826240.

The previous prime is 38421809. The next prime is 38421821. The reversal of 38421820 is 2812483.

It is a super-2 number, since 2×38421820² = 2952472504224800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38421821) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 70750 + ... + 71290.

It is an arithmetic number, because the mean of its divisors is an integer number (1741446).

Almost surely, 2^38421820 is an apocalyptic number.

It is an amenable number.

38421820 is an abundant number, since it is smaller than the sum of its proper divisors (45167588).

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

38421820 is a wasteful number, since it uses less digits than its factorization.

38421820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 670 (or 668 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 38421820 is about 6198.5336975772. The cubic root of 38421820 is about 337.4369557596.

The spelling of 38421820 in words is "thirty-eight million, four hundred twenty-one thousand, eight hundred twenty".