994273781 has 16 divisors (see below), whose sum is σ = 1111368960. Its totient is φ = 886431168.

The previous prime is 994273751. The next prime is 994273783. The reversal of 994273781 is 187372499.

It is not a de Polignac number, because 994273781 - 2⁶ = 994273717 is a prime.

It is a super-2 number, since 2×994273781² = 1977160703168071922, 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 (994273783) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 112340 + ... + 120866.

It is an arithmetic number, because the mean of its divisors is an integer number (69460560).

Almost surely, 2^994273781 is an apocalyptic number.

It is an amenable number.

994273781 is a deficient number, since it is larger than the sum of its proper divisors (117095179).

994273781 is an equidigital number, since it uses as much as digits as its factorization.

994273781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8601 (or 8563 counting only the distinct ones).

The product of its digits is 762048, while the sum is 50.

The square root of 994273781 is about 31532.1071449404. The cubic root of 994273781 is about 998.0876054116.

The spelling of 994273781 in words is "nine hundred ninety-four million, two hundred seventy-three thousand, seven hundred eighty-one".