39946981 has 2 divisors, whose sum is σ = 39946982. Its totient is φ = 39946980.

The previous prime is 39946967. The next prime is 39947051. The reversal of 39946981 is 18964993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36796356 + 3150625 = 6066^2 + 1775^2 .

It is a cyclic number.

It is not a de Polignac number, because 39946981 - 2⁷ = 39946853 is a prime.

It is a super-2 number, since 2×39946981² = 3191522582028722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39946931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19973490 + 19973491.

It is an arithmetic number, because the mean of its divisors is an integer number (19973491).

Almost surely, 2^39946981 is an apocalyptic number.

It is an amenable number.

39946981 is a deficient number, since it is larger than the sum of its proper divisors (1).

39946981 is an equidigital number, since it uses as much as digits as its factorization.

39946981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 419904, while the sum is 49.

The square root of 39946981 is about 6320.3624104951. The cubic root of 39946981 is about 341.8440205010.

The spelling of 39946981 in words is "thirty-nine million, nine hundred forty-six thousand, nine hundred eighty-one".