39940848981 has 40 divisors (see below), whose sum is σ = 65626891968. Its totient is φ = 24206509800.

The previous prime is 39940848977. The next prime is 39940848989. The reversal of 39940848981 is 18984804993.

39940848981 is a `hidden beast` number, since 39 + 9 + 40 + 8 + 489 + 81 = 666.

It is not a de Polignac number, because 39940848981 - 2² = 39940848977 is a prime.

It is a super-2 number, since 2×39940848981² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39940848989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 77425 + ... + 293046.

Almost surely, 2^39940848981 is an apocalyptic number.

It is an amenable number.

39940848981 is a deficient number, since it is larger than the sum of its proper divisors (25686042987).

39940848981 is an equidigital number, since it uses as much as digits as its factorization.

39940848981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 370516 (or 370485 counting only the distinct ones).

The product of its (nonzero) digits is 17915904, while the sum is 63.

The spelling of 39940848981 in words is "thirty-nine billion, nine hundred forty million, eight hundred forty-eight thousand, nine hundred eighty-one".