1994263911 has 24 divisors (see below), whose sum is σ = 2971580144. Its totient is φ = 1288172160.

The previous prime is 1994263907. The next prime is 1994263919. The reversal of 1994263911 is 1193624991.

1994263911 is a `hidden beast` number, since 1 + 9 + 9 + 4 + 2 + 639 + 1 + 1 = 666.

It is not a de Polignac number, because 1994263911 - 2² = 1994263907 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1994263919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9675 + ... + 63891.

Almost surely, 2^1994263911 is an apocalyptic number.

1994263911 is a deficient number, since it is larger than the sum of its proper divisors (977316233).

1994263911 is a wasteful number, since it uses less digits than its factorization.

1994263911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54351 (or 54348 counting only the distinct ones).

The product of its digits is 104976, while the sum is 45.

The square root of 1994263911 is about 44657.1820763469. The cubic root of 1994263911 is about 1258.7153933211.

The spelling of 1994263911 in words is "one billion, nine hundred ninety-four million, two hundred sixty-three thousand, nine hundred eleven".