39991954000 has 80 divisors (see below), whose sum is σ = 96780140496. Its totient is φ = 15983616000.

The previous prime is 39991953949. The next prime is 39991954003. The reversal of 39991954000 is 45919993.

It can be written as a sum of positive squares in 8 ways, for example, as 3445220416 + 36546733584 = 58696^2 + 191172^2 .

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39991954003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2634432 + ... + 2649568.

Almost surely, 2^39991954000 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 39991954000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48390070248).

39991954000 is an abundant number, since it is smaller than the sum of its proper divisors (56788186496).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

39991954000 is a wasteful number, since it uses less digits than its factorization.

39991954000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16481 (or 16465 counting only the distinct ones).

The product of its (nonzero) digits is 393660, while the sum is 49.

The spelling of 39991954000 in words is "thirty-nine billion, nine hundred ninety-one million, nine hundred fifty-four thousand".