39981940090 has 16 divisors (see below), whose sum is σ = 71973518760. Its totient is φ = 15991436800.

The previous prime is 39981940079. The next prime is 39981940121. The reversal of 39981940090 is 9004918993.

It can be written as a sum of positive squares in 4 ways, for example, as 14846691409 + 25135248681 = 121847^2 + 158541^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37195 + ... + 285214.

Almost surely, 2^39981940090 is an apocalyptic number.

39981940090 is a deficient number, since it is larger than the sum of its proper divisors (31991578670).

39981940090 is a wasteful number, since it uses less digits than its factorization.

39981940090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334817.

The product of its (nonzero) digits is 629856, while the sum is 52.

The spelling of 39981940090 in words is "thirty-nine billion, nine hundred eighty-one million, nine hundred forty thousand, ninety".