39980857999 has 4 divisors (see below), whose sum is σ = 40658499720. Its totient is φ = 39303216280.

The previous prime is 39980857937. The next prime is 39980858003. The reversal of 39980857999 is 99975808993.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 39980857999 - 2¹⁹ = 39980333711 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39980857699) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 338820772 + ... + 338820889.

It is an arithmetic number, because the mean of its divisors is an integer number (10164624930).

Almost surely, 2^39980857999 is an apocalyptic number.

39980857999 is a deficient number, since it is larger than the sum of its proper divisors (677641721).

39980857999 is an equidigital number, since it uses as much as digits as its factorization.

39980857999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 677641720.

The product of its (nonzero) digits is 396809280, while the sum is 76.

The spelling of 39980857999 in words is "thirty-nine billion, nine hundred eighty million, eight hundred fifty-seven thousand, nine hundred ninety-nine".