39138229 has 4 divisors (see below), whose sum is σ = 42148876. Its totient is φ = 36127584.

The previous prime is 39138227. The next prime is 39138241. The reversal of 39138229 is 92283193.

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 23716900 + 15421329 = 4870^2 + 3927^2 .

It is a cyclic number.

It is not a de Polignac number, because 39138229 - 2¹ = 39138227 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 (39138223) 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, 1505304 + ... + 1505329.

It is an arithmetic number, because the mean of its divisors is an integer number (10537219).

Almost surely, 2^39138229 is an apocalyptic number.

It is an amenable number.

39138229 is a deficient number, since it is larger than the sum of its proper divisors (3010647).

39138229 is a wasteful number, since it uses less digits than its factorization.

39138229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3010646.

The product of its digits is 23328, while the sum is 37.

The square root of 39138229 is about 6256.0553865835. The cubic root of 39138229 is about 339.5213246742.

The spelling of 39138229 in words is "thirty-nine million, one hundred thirty-eight thousand, two hundred twenty-nine".