39705642 has 24 divisors (see below), whose sum is σ = 91090116. Its totient is φ = 12456576.

The previous prime is 39705629. The next prime is 39705683. The reversal of 39705642 is 24650793.

39705642 is a `hidden beast` number, since 3 + 9 + 7 + 0 + 5 + 642 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 39200121 + 505521 = 6261^2 + 711^2 .

It is a junction number, because it is equal to n+sod(n) for n = 39705597 and 39705606.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 64573 + ... + 65184.

Almost surely, 2^39705642 is an apocalyptic number.

39705642 is an abundant number, since it is smaller than the sum of its proper divisors (51384474).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

39705642 is a wasteful number, since it uses less digits than its factorization.

39705642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129782 (or 129779 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 36.

The square root of 39705642 is about 6301.2413062824. The cubic root of 39705642 is about 341.1542145527.

The spelling of 39705642 in words is "thirty-nine million, seven hundred five thousand, six hundred forty-two".