39649452981 has 8 divisors (see below), whose sum is σ = 52869545664. Its totient is φ = 26431164480.

The previous prime is 39649452979. The next prime is 39649453007. The reversal of 39649452981 is 18925494693.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 39649452981 - 2¹ = 39649452979 is a prime.

It is a super-3 number, since 3×39649452981³ (a number of 33 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39649452961) 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 7 ways as a sum of consecutive naturals, for example, 398905 + ... + 488286.

It is an arithmetic number, because the mean of its divisors is an integer number (6608693208).

Almost surely, 2^39649452981 is an apocalyptic number.

It is an amenable number.

39649452981 is a deficient number, since it is larger than the sum of its proper divisors (13220092683).

39649452981 is a wasteful number, since it uses less digits than its factorization.

39649452981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 902091.

The product of its digits is 16796160, while the sum is 60.

The spelling of 39649452981 in words is "thirty-nine billion, six hundred forty-nine million, four hundred fifty-two thousand, nine hundred eighty-one".