39804694981 has 8 divisors (see below), whose sum is σ = 41215822200. Its totient is φ = 38396137920.

The previous prime is 39804694967. The next prime is 39804694987. The reversal of 39804694981 is 18949640893.

It can be written as a sum of positive squares in 4 ways, for example, as 60684100 + 39744010881 = 7790^2 + 199359^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 39804694981 - 2⁹ = 39804694469 is a prime.

It is a super-2 number, since 2×39804694981² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39804694987) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 610990 + ... + 672991.

It is an arithmetic number, because the mean of its divisors is an integer number (5151977775).

Almost surely, 2^39804694981 is an apocalyptic number.

It is an amenable number.

39804694981 is a deficient number, since it is larger than the sum of its proper divisors (1411127219).

39804694981 is a wasteful number, since it uses less digits than its factorization.

39804694981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1285079.

The product of its (nonzero) digits is 13436928, while the sum is 61.

The spelling of 39804694981 in words is "thirty-nine billion, eight hundred four million, six hundred ninety-four thousand, nine hundred eighty-one".