39946681 has 4 divisors (see below), whose sum is σ = 39978112. Its totient is φ = 39915252.

The previous prime is 39946657. The next prime is 39946691. The reversal of 39946681 is 18664993.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 39946681 - 2⁵ = 39946649 is a prime.

It is a super-2 number, since 2×39946681² = 3191474645831522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39946691) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13725 + ... + 16378.

It is an arithmetic number, because the mean of its divisors is an integer number (9994528).

Almost surely, 2^39946681 is an apocalyptic number.

It is an amenable number.

39946681 is a deficient number, since it is larger than the sum of its proper divisors (31431).

39946681 is a wasteful number, since it uses less digits than its factorization.

39946681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31430.

The product of its digits is 279936, while the sum is 46.

The square root of 39946681 is about 6320.3386776343. The cubic root of 39946681 is about 341.8431647545.

The spelling of 39946681 in words is "thirty-nine million, nine hundred forty-six thousand, six hundred eighty-one".