38212109 has 4 divisors (see below), whose sum is σ = 41151516. Its totient is φ = 35272704.

The previous prime is 38212103. The next prime is 38212127. The reversal of 38212109 is 90121283.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90121283 = 7 ⋅12874469.

It can be written as a sum of positive squares in 2 ways, for example, as 2630884 + 35581225 = 1622^2 + 5965^2 .

It is a cyclic number.

It is not a de Polignac number, because 38212109 - 2¹⁶ = 38146573 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38212103) 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, 1469684 + ... + 1469709.

It is an arithmetic number, because the mean of its divisors is an integer number (10287879).

Almost surely, 2^38212109 is an apocalyptic number.

It is an amenable number.

38212109 is a deficient number, since it is larger than the sum of its proper divisors (2939407).

38212109 is a wasteful number, since it uses less digits than its factorization.

38212109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2939406.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 38212109 is about 6181.5943736224. The cubic root of 38212109 is about 336.8219113232.

The spelling of 38212109 in words is "thirty-eight million, two hundred twelve thousand, one hundred nine".