39173985 has 12 divisors (see below), whose sum is σ = 67901652. Its totient is φ = 20892768.

The previous prime is 39173969. The next prime is 39174007. The reversal of 39173985 is 58937193.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 26040609 + 13133376 = 5103^2 + 3624^2 .

It is not a de Polignac number, because 39173985 - 2⁴ = 39173969 is a prime.

It is a super-2 number, since 2×39173985² = 3069202201560450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 870533 = 39173985 / (3 + 9 + 1 + 7 + 3 + 9 + 8 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 39173985.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 435222 + ... + 435311.

It is an arithmetic number, because the mean of its divisors is an integer number (5658471).

Almost surely, 2^39173985 is an apocalyptic number.

It is an amenable number.

39173985 is a deficient number, since it is larger than the sum of its proper divisors (28727667).

39173985 is a wasteful number, since it uses less digits than its factorization.

39173985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 870544 (or 870541 counting only the distinct ones).

The product of its digits is 204120, while the sum is 45.

The square root of 39173985 is about 6258.9124454653. The cubic root of 39173985 is about 339.6246867810.

The spelling of 39173985 in words is "thirty-nine million, one hundred seventy-three thousand, nine hundred eighty-five".