1004995821 has 8 divisors (see below), whose sum is σ = 1340745664. Its totient is φ = 669621600.

The previous prime is 1004995819. The next prime is 1004995829. The reversal of 1004995821 is 1285994001.

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

It is not a de Polignac number, because 1004995821 - 2¹ = 1004995819 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1004995821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1004995829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87601 + ... + 98406.

It is an arithmetic number, because the mean of its divisors is an integer number (167593208).

Almost surely, 2^1004995821 is an apocalyptic number.

It is an amenable number.

1004995821 is a deficient number, since it is larger than the sum of its proper divisors (335749843).

1004995821 is a wasteful number, since it uses less digits than its factorization.

1004995821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187811.

The product of its (nonzero) digits is 25920, while the sum is 39.

The square root of 1004995821 is about 31701.6690570071. The cubic root of 1004995821 is about 1001.6625082015.

The spelling of 1004995821 in words is "one billion, four million, nine hundred ninety-five thousand, eight hundred twenty-one".