38213613 has 20 divisors (see below), whose sum is σ = 57250908. Its totient is φ = 25401600.

The previous prime is 38213611. The next prime is 38213621. The reversal of 38213613 is 31631283.

It is a happy number.

38213613 is a `hidden beast` number, since 38 + 2 + 13 + 613 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 23444964 + 14768649 = 4842^2 + 3843^2 .

It is not a de Polignac number, because 38213613 - 2¹ = 38213611 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38213611) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 54163 + ... + 54863.

Almost surely, 2^38213613 is an apocalyptic number.

It is an amenable number.

38213613 is a deficient number, since it is larger than the sum of its proper divisors (19037295).

38213613 is an equidigital number, since it uses as much as digits as its factorization.

38213613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1386 (or 1377 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 38213613 is about 6181.7160238885. The cubic root of 38213613 is about 336.8263302847.

Adding to 38213613 its reverse (31631283), we get a palindrome (69844896).

The spelling of 38213613 in words is "thirty-eight million, two hundred thirteen thousand, six hundred thirteen".