38900000 has 72 divisors (see below), whose sum is σ = 95970420. Its totient is φ = 15520000.

The previous prime is 38899981. The next prime is 38900003. The reversal of 38900000 is 983.

It can be written as a sum of positive squares in 6 ways, for example, as 8737936 + 30162064 = 2956^2 + 5492^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (38900003) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 99806 + ... + 100194.

Almost surely, 2^38900000 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 38900000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47985210).

38900000 is an abundant number, since it is smaller than the sum of its proper divisors (57070420).

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

38900000 is an frugal number, since it uses more digits than its factorization.

38900000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424 (or 396 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 38900000 is about 6236.9864518051. The cubic root of 38900000 is about 338.8310490834.

Adding to 38900000 its reverse (983), we get a palindrome (38900983).

The spelling of 38900000 in words is "thirty-eight million, nine hundred thousand".