39724138 has 8 divisors (see below), whose sum is σ = 63091332. Its totient is φ = 18693696.

The previous prime is 39724129. The next prime is 39724141. The reversal of 39724138 is 83142793.

It can be written as a sum of positive squares in 2 ways, for example, as 33558849 + 6165289 = 5793^2 + 2483^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 39724097 and 39724106.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 584145 + ... + 584212.

Almost surely, 2^39724138 is an apocalyptic number.

39724138 is a deficient number, since it is larger than the sum of its proper divisors (23367194).

39724138 is a wasteful number, since it uses less digits than its factorization.

39724138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1168376.

The product of its digits is 36288, while the sum is 37.

The square root of 39724138 is about 6302.7087827378. The cubic root of 39724138 is about 341.2071793918.

The spelling of 39724138 in words is "thirty-nine million, seven hundred twenty-four thousand, one hundred thirty-eight".