39681985 has 16 divisors (see below), whose sum is σ = 55036800. Its totient is φ = 26902656.

The previous prime is 39681949. The next prime is 39682003. The reversal of 39681985 is 58918693.

It is a cyclic number.

It is not a de Polignac number, because 39681985 - 2²³ = 31293377 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3255 + ... + 9484.

It is an arithmetic number, because the mean of its divisors is an integer number (3439800).

Almost surely, 2^39681985 is an apocalyptic number.

39681985 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

39681985 is a deficient number, since it is larger than the sum of its proper divisors (15354815).

39681985 is a wasteful number, since it uses less digits than its factorization.

39681985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12840.

The product of its digits is 466560, while the sum is 49.

The square root of 39681985 is about 6299.3638567716. The cubic root of 39681985 is about 341.0864467810.

The spelling of 39681985 in words is "thirty-nine million, six hundred eighty-one thousand, nine hundred eighty-five".