39681983 has 4 divisors (see below), whose sum is σ = 43289448. Its totient is φ = 36074520.

The previous prime is 39681949. The next prime is 39682003. The reversal of 39681983 is 38918693.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 39681983 - 2⁶ = 39681919 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39689983) 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, 1803716 + ... + 1803737.

It is an arithmetic number, because the mean of its divisors is an integer number (10822362).

Almost surely, 2^39681983 is an apocalyptic number.

39681983 is a deficient number, since it is larger than the sum of its proper divisors (3607465).

39681983 is a wasteful number, since it uses less digits than its factorization.

39681983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3607464.

The product of its digits is 279936, while the sum is 47.

The square root of 39681983 is about 6299.3636980254. The cubic root of 39681983 is about 341.0864410507.

The spelling of 39681983 in words is "thirty-nine million, six hundred eighty-one thousand, nine hundred eighty-three".