994407821 has 8 divisors (see below), whose sum is σ = 1085539104. Its totient is φ = 903398320.

The previous prime is 994407803. The next prime is 994407833. The reversal of 994407821 is 128704499.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 994407821 - 2²² = 990213517 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (994407871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12926 + ... + 46431.

It is an arithmetic number, because the mean of its divisors is an integer number (135692388).

Almost surely, 2^994407821 is an apocalyptic number.

It is an amenable number.

994407821 is a deficient number, since it is larger than the sum of its proper divisors (91131283).

994407821 is a wasteful number, since it uses less digits than its factorization.

994407821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60891.

The product of its (nonzero) digits is 145152, while the sum is 44.

The square root of 994407821 is about 31534.2325259392. The cubic root of 994407821 is about 998.1324547793.

The spelling of 994407821 in words is "nine hundred ninety-four million, four hundred seven thousand, eight hundred twenty-one".