39720941 has 4 divisors (see below), whose sum is σ = 42776412. Its totient is φ = 36665472.

The previous prime is 39720937. The next prime is 39720953. The reversal of 39720941 is 14902793.

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 11055625 + 28665316 = 3325^2 + 5354^2 .

It is a cyclic number.

It is not a de Polignac number, because 39720941 - 2² = 39720937 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 (39720911) 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, 1527716 + ... + 1527741.

It is an arithmetic number, because the mean of its divisors is an integer number (10694103).

Almost surely, 2^39720941 is an apocalyptic number.

It is an amenable number.

39720941 is a deficient number, since it is larger than the sum of its proper divisors (3055471).

39720941 is a wasteful number, since it uses less digits than its factorization.

39720941 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3055470.

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 39720941 is about 6302.4551565243. The cubic root of 39720941 is about 341.1980256910.

The spelling of 39720941 in words is "thirty-nine million, seven hundred twenty thousand, nine hundred forty-one".