39870705 has 16 divisors (see below), whose sum is σ = 72906624. Its totient is φ = 18226560.

The previous prime is 39870671. The next prime is 39870709. The reversal of 39870705 is 50707893.

It is not a de Polignac number, because 39870705 - 2⁷ = 39870577 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (39870709) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 189756 + ... + 189965.

It is an arithmetic number, because the mean of its divisors is an integer number (4556664).

Almost surely, 2^39870705 is an apocalyptic number.

39870705 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

39870705 is a deficient number, since it is larger than the sum of its proper divisors (33035919).

39870705 is a wasteful number, since it uses less digits than its factorization.

39870705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379736.

The product of its (nonzero) digits is 52920, while the sum is 39.

The square root of 39870705 is about 6314.3253796427. The cubic root of 39870705 is about 341.6263060263.

The spelling of 39870705 in words is "thirty-nine million, eight hundred seventy thousand, seven hundred five".