39789945 has 48 divisors (see below), whose sum is σ = 78663312. Its totient is φ = 18432000.

The previous prime is 39789941. The next prime is 39789947. The reversal of 39789945 is 54998793.

It can be written as a sum of positive squares in 8 ways, for example, as 6335289 + 33454656 = 2517^2 + 5784^2 .

It is not a de Polignac number, because 39789945 - 2² = 39789941 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 39789891 and 39789900.

It is not an unprimeable number, because it can be changed into a prime (39789941) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7945 + ... + 11945.

It is an arithmetic number, because the mean of its divisors is an integer number (1638819).

Almost surely, 2^39789945 is an apocalyptic number.

It is an amenable number.

39789945 is a deficient number, since it is larger than the sum of its proper divisors (38873367).

39789945 is a wasteful number, since it uses less digits than its factorization.

39789945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4042 (or 4039 counting only the distinct ones).

The product of its digits is 2449440, while the sum is 54.

The square root of 39789945 is about 6307.9271555718. The cubic root of 39789945 is about 341.3954900293.

The spelling of 39789945 in words is "thirty-nine million, seven hundred eighty-nine thousand, nine hundred forty-five".