1004909021 has 16 divisors (see below), whose sum is σ = 1045708800. Its totient is φ = 965063808.

The previous prime is 1004908999. The next prime is 1004909053. The reversal of 1004909021 is 1209094001.

It is a cyclic number.

It is not a de Polignac number, because 1004909021 - 2²² = 1000714717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1004900021) 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, 785060 + ... + 786338.

It is an arithmetic number, because the mean of its divisors is an integer number (65356800).

Almost surely, 2^1004909021 is an apocalyptic number.

It is an amenable number.

1004909021 is a deficient number, since it is larger than the sum of its proper divisors (40799779).

1004909021 is a wasteful number, since it uses less digits than its factorization.

1004909021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1628.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 1004909021 is about 31700.3000143532. The cubic root of 1004909021 is about 1001.6336700023.

The spelling of 1004909021 in words is "one billion, four million, nine hundred nine thousand, twenty-one".