39906705 has 8 divisors (see below), whose sum is σ = 63850752. Its totient is φ = 21283568.

The previous prime is 39906677. The next prime is 39906743. The reversal of 39906705 is 50760993.

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

It is a cyclic number.

It is not a de Polignac number, because 39906705 - 2⁷ = 39906577 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1330209 + ... + 1330238.

It is an arithmetic number, because the mean of its divisors is an integer number (7981344).

Almost surely, 2^39906705 is an apocalyptic number.

It is an amenable number.

39906705 is a deficient number, since it is larger than the sum of its proper divisors (23944047).

39906705 is a wasteful number, since it uses less digits than its factorization.

39906705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2660455.

The product of its (nonzero) digits is 51030, while the sum is 39.

The square root of 39906705 is about 6317.1753972800. The cubic root of 39906705 is about 341.7290953411.

The spelling of 39906705 in words is "thirty-nine million, nine hundred six thousand, seven hundred five".