1993894631 has 4 divisors (see below), whose sum is σ = 2013636264. Its totient is φ = 1974153000.

The previous prime is 1993894627. The next prime is 1993894709. The reversal of 1993894631 is 1364983991.

It is a happy number.

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 1993894631 - 2² = 1993894627 is a prime.

It is a super-2 number, since 2×1993894631² = 7951231599061252322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1993894621) 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 3 ways as a sum of consecutive naturals, for example, 9870665 + ... + 9870866.

It is an arithmetic number, because the mean of its divisors is an integer number (503409066).

Almost surely, 2^1993894631 is an apocalyptic number.

1993894631 is a deficient number, since it is larger than the sum of its proper divisors (19741633).

1993894631 is a wasteful number, since it uses less digits than its factorization.

1993894631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19741632.

The product of its digits is 1259712, while the sum is 53.

The square root of 1993894631 is about 44653.0472756339. The cubic root of 1993894631 is about 1258.6376959627.

The spelling of 1993894631 in words is "one billion, nine hundred ninety-three million, eight hundred ninety-four thousand, six hundred thirty-one".