1940005863817 has 4 divisors (see below), whose sum is σ = 2217149558656. Its totient is φ = 1662862168980.

The previous prime is 1940005863787. The next prime is 1940005863823. The reversal of 1940005863817 is 7183685000491.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1940005863817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1940005863217) 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, 138571847409 + ... + 138571847422.

It is an arithmetic number, because the mean of its divisors is an integer number (554287389664).

Almost surely, 2^{1940005863817} is an apocalyptic number.

It is an amenable number.

1940005863817 is a deficient number, since it is larger than the sum of its proper divisors (277143694839).

1940005863817 is an equidigital number, since it uses as much as digits as its factorization.

1940005863817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277143694838.

The product of its (nonzero) digits is 1451520, while the sum is 52.

The spelling of 1940005863817 in words is "one trillion, nine hundred forty billion, five million, eight hundred sixty-three thousand, eight hundred seventeen".