38228581 has 4 divisors (see below), whose sum is σ = 38297772. Its totient is φ = 38159392.

The previous prime is 38228569. The next prime is 38228587. The reversal of 38228581 is 18582283.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14861025 + 23367556 = 3855^2 + 4834^2 .

It is a cyclic number.

It is not a de Polignac number, because 38228581 - 2⁷ = 38228453 is a prime.

It is a super-2 number, since 2×38228581² = 2922848810547122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 38228581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38228587) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33760 + ... + 34873.

It is an arithmetic number, because the mean of its divisors is an integer number (9574443).

Almost surely, 2^38228581 is an apocalyptic number.

It is an amenable number.

38228581 is a deficient number, since it is larger than the sum of its proper divisors (69191).

38228581 is an equidigital number, since it uses as much as digits as its factorization.

38228581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69190.

The product of its digits is 30720, while the sum is 37.

The square root of 38228581 is about 6182.9265724251. The cubic root of 38228581 is about 336.8703020354.

It can be divided in two parts, 38228 and 581, that added together give a square (38809 = 197²).

The spelling of 38228581 in words is "thirty-eight million, two hundred twenty-eight thousand, five hundred eighty-one".