39894740999 has 4 divisors (see below), whose sum is σ = 41181668160. Its totient is φ = 38607813840.

The previous prime is 39894740987. The next prime is 39894741017. The reversal of 39894740999 is 99904749893.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39894740999 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 (39894740099) 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, 643463534 + ... + 643463595.

It is an arithmetic number, because the mean of its divisors is an integer number (10295417040).

Almost surely, 2^39894740999 is an apocalyptic number.

39894740999 is a deficient number, since it is larger than the sum of its proper divisors (1286927161).

39894740999 is a wasteful number, since it uses less digits than its factorization.

39894740999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1286927160.

The product of its (nonzero) digits is 158723712, while the sum is 71.

The spelling of 39894740999 in words is "thirty-nine billion, eight hundred ninety-four million, seven hundred forty thousand, nine hundred ninety-nine".