39946691 has 2 divisors, whose sum is σ = 39946692. Its totient is φ = 39946690.

The previous prime is 39946657. The next prime is 39946703. The reversal of 39946691 is 19664993.

It is a strong prime.

It is an emirp because it is prime and its reverse (19664993) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39946691 is a prime.

It is a super-3 number, since 3×39946691³ (a number of 24 digits) contains 333 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (39946591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19973345 + 19973346.

It is an arithmetic number, because the mean of its divisors is an integer number (19973346).

Almost surely, 2^39946691 is an apocalyptic number.

39946691 is a deficient number, since it is larger than the sum of its proper divisors (1).

39946691 is an equidigital number, since it uses as much as digits as its factorization.

39946691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 314928, while the sum is 47.

The square root of 39946691 is about 6320.3394687311. The cubic root of 39946691 is about 341.8431932794.

The spelling of 39946691 in words is "thirty-nine million, nine hundred forty-six thousand, six hundred ninety-one".