4004921 has 16 divisors (see below), whose sum is σ = 4451328. Its totient is φ = 3590400.

The previous prime is 4004909. The next prime is 4004933. The reversal of 4004921 is 1294004.

It is an interprime number because it is at equal distance from previous prime (4004909) and next prime (4004933).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4004921 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 4004893 and 4004902.

It is not an unprimeable number, because it can be changed into a prime (4004951) 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, 29165 + ... + 29301.

It is an arithmetic number, because the mean of its divisors is an integer number (278208).

Almost surely, 2^4004921 is an apocalyptic number.

4004921 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

4004921 is a deficient number, since it is larger than the sum of its proper divisors (446407).

4004921 is a wasteful number, since it uses less digits than its factorization.

4004921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 4004921 is about 2001.2298718538. The cubic root of 4004921 is about 158.8051751915.

Adding to 4004921 its reverse (1294004), we get a palindrome (5298925).

The spelling of 4004921 in words is "four million, four thousand, nine hundred twenty-one".