39723913 has 2 divisors, whose sum is σ = 39723914. Its totient is φ = 39723912.

The previous prime is 39723911. The next prime is 39723919. The reversal of 39723913 is 31932793.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38105929 + 1617984 = 6173^2 + 1272^2 .

It is a cyclic number.

It is not a de Polignac number, because 39723913 - 2¹ = 39723911 is a prime.

Together with 39723911, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (39723911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19861956 + 19861957.

It is an arithmetic number, because the mean of its divisors is an integer number (19861957).

Almost surely, 2^39723913 is an apocalyptic number.

It is an amenable number.

39723913 is a deficient number, since it is larger than the sum of its proper divisors (1).

39723913 is an equidigital number, since it uses as much as digits as its factorization.

39723913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30618, while the sum is 37.

The square root of 39723913 is about 6302.6909332443. The cubic root of 39723913 is about 341.2065351843.

It can be divided in two parts, 397 and 23913, that added together give a triangular number (24310 = T₂₂₀).

The spelling of 39723913 in words is "thirty-nine million, seven hundred twenty-three thousand, nine hundred thirteen".