993992881 has 12 divisors (see below), whose sum is σ = 1160898480. Its totient is φ = 848589000.

The previous prime is 993992837. The next prime is 993992891. The reversal of 993992881 is 188299399.

It is not a de Polignac number, because 993992881 - 2²³ = 985604273 is a prime.

It is a super-2 number, since 2×993992881² = 1976043694957360322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (993992891) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28111 + ... + 52708.

It is an arithmetic number, because the mean of its divisors is an integer number (96741540).

Almost surely, 2^993992881 is an apocalyptic number.

It is an amenable number.

993992881 is a deficient number, since it is larger than the sum of its proper divisors (166905599).

993992881 is a wasteful number, since it uses less digits than its factorization.

993992881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81084 (or 81077 counting only the distinct ones).

The product of its digits is 2519424, while the sum is 58.

The square root of 993992881 is about 31527.6526401824. The cubic root of 993992881 is about 997.9936040677.

The spelling of 993992881 in words is "nine hundred ninety-three million, nine hundred ninety-two thousand, eight hundred eighty-one".