39687961 has 4 divisors (see below), whose sum is σ = 39737124. Its totient is φ = 39638800.

The previous prime is 39687953. The next prime is 39687971. The reversal of 39687961 is 16978693.

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 22382361 + 17305600 = 4731^2 + 4160^2 .

It is a cyclic number.

It is not a de Polignac number, because 39687961 - 2³ = 39687953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39687971) 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, 23350 + ... + 24991.

It is an arithmetic number, because the mean of its divisors is an integer number (9934281).

Almost surely, 2^39687961 is an apocalyptic number.

It is an amenable number.

39687961 is a deficient number, since it is larger than the sum of its proper divisors (49163).

39687961 is an equidigital number, since it uses as much as digits as its factorization.

39687961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49162.

The product of its digits is 489888, while the sum is 49.

The square root of 39687961 is about 6299.8381725248. The cubic root of 39687961 is about 341.1035681548.

The spelling of 39687961 in words is "thirty-nine million, six hundred eighty-seven thousand, nine hundred sixty-one".