39945149 has 4 divisors (see below), whose sum is σ = 39981660. Its totient is φ = 39908640.

The previous prime is 39945119. The next prime is 39945173. The reversal of 39945149 is 94154993.

It is a happy number.

39945149 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 18619225 + 21325924 = 4315^2 + 4618^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39945149 is a prime.

It is a super-2 number, since 2×39945149² = 3191229857264402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39945119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16562 + ... + 18819.

It is an arithmetic number, because the mean of its divisors is an integer number (9995415).

Almost surely, 2^39945149 is an apocalyptic number.

It is an amenable number.

39945149 is a deficient number, since it is larger than the sum of its proper divisors (36511).

39945149 is a wasteful number, since it uses less digits than its factorization.

39945149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36510.

The product of its digits is 174960, while the sum is 44.

The square root of 39945149 is about 6320.2174804353. The cubic root of 39945149 is about 341.8387946758.

The spelling of 39945149 in words is "thirty-nine million, nine hundred forty-five thousand, one hundred forty-nine".