39442145 has 4 divisors (see below), whose sum is σ = 47330580. Its totient is φ = 31553712.

The previous prime is 39442141. The next prime is 39442189. The reversal of 39442145 is 54124493.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54124493 = 3863 ⋅14011.

It can be written as a sum of positive squares in 2 ways, for example, as 27636049 + 11806096 = 5257^2 + 3436^2 .

It is a cyclic number.

It is not a de Polignac number, because 39442145 - 2² = 39442141 is a prime.

It is not an unprimeable number, because it can be changed into a prime (39442141) 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, 3944210 + ... + 3944219.

It is an arithmetic number, because the mean of its divisors is an integer number (11832645).

Almost surely, 2^39442145 is an apocalyptic number.

It is an amenable number.

39442145 is a deficient number, since it is larger than the sum of its proper divisors (7888435).

39442145 is an equidigital number, since it uses as much as digits as its factorization.

39442145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7888434.

The product of its digits is 17280, while the sum is 32.

The square root of 39442145 is about 6280.2981617118. The cubic root of 39442145 is about 340.3978761979.

The spelling of 39442145 in words is "thirty-nine million, four hundred forty-two thousand, one hundred forty-five".