39007331981 has 16 divisors (see below), whose sum is σ = 40463161200. Its totient is φ = 37576704000.

The previous prime is 39007331969. The next prime is 39007331989. The reversal of 39007331981 is 18913370093.

It can be written as a sum of positive squares in 8 ways, for example, as 4153802500 + 34853529481 = 64450^2 + 186691^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39007331981 is a prime.

It is a super-2 number, since 2×39007331981² (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 (39007331989) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2799131 + ... + 2813031.

It is an arithmetic number, because the mean of its divisors is an integer number (2528947575).

Almost surely, 2^39007331981 is an apocalyptic number.

It is an amenable number.

39007331981 is a deficient number, since it is larger than the sum of its proper divisors (1455829219).

39007331981 is a wasteful number, since it uses less digits than its factorization.

39007331981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14800.

The product of its (nonzero) digits is 122472, while the sum is 44.

The spelling of 39007331981 in words is "thirty-nine billion, seven million, three hundred thirty-one thousand, nine hundred eighty-one".