39138121 has 4 divisors (see below), whose sum is σ = 42696144. Its totient is φ = 35580100.

The previous prime is 39138109. The next prime is 39138133. The reversal of 39138121 is 12183193.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (39138109) and next prime (39138133).

It is a cyclic number.

It is not a de Polignac number, because 39138121 - 2¹¹ = 39136073 is a prime.

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 39138121.

It is not an unprimeable number, because it can be changed into a prime (39138721) 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, 1778995 + ... + 1779016.

It is an arithmetic number, because the mean of its divisors is an integer number (10674036).

Almost surely, 2^39138121 is an apocalyptic number.

It is an amenable number.

39138121 is a deficient number, since it is larger than the sum of its proper divisors (3558023).

39138121 is a wasteful number, since it uses less digits than its factorization.

39138121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3558022.

The product of its digits is 1296, while the sum is 28.

The square root of 39138121 is about 6256.0467549404. The cubic root of 39138121 is about 339.5210123765.

The spelling of 39138121 in words is "thirty-nine million, one hundred thirty-eight thousand, one hundred twenty-one".