39681193 has 8 divisors (see below), whose sum is σ = 41416200. Its totient is φ = 37970688.

The previous prime is 39681151. The next prime is 39681199. The reversal of 39681193 is 39118693.

It can be written as a sum of positive squares in 4 ways, for example, as 7327849 + 32353344 = 2707^2 + 5688^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 39681193 - 2¹³ = 39673001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39681199) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2778 + ... + 9331.

It is an arithmetic number, because the mean of its divisors is an integer number (5177025).

Almost surely, 2^39681193 is an apocalyptic number.

It is an amenable number.

39681193 is a deficient number, since it is larger than the sum of its proper divisors (1735007).

39681193 is a wasteful number, since it uses less digits than its factorization.

39681193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12251.

The product of its digits is 34992, while the sum is 40.

The square root of 39681193 is about 6299.3009929674. The cubic root of 39681193 is about 341.0841775543.

Subtracting from 39681193 its reverse (39118693), we obtain a square (562500 = 750²).

The spelling of 39681193 in words is "thirty-nine million, six hundred eighty-one thousand, one hundred ninety-three".