1003921 has 8 divisors (see below), whose sum is σ = 1056704. Its totient is φ = 952560.

The previous prime is 1003913. The next prime is 1003931. The reversal of 1003921 is 1293001.

1003921 = 78² + 79² + ... + 151².

1003921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 1003921 - 2³ = 1003913 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1003895 and 1003904.

It is not an unprimeable number, because it can be changed into a prime (1003931) 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, 1276 + ... + 1906.

It is an arithmetic number, because the mean of its divisors is an integer number (132088).

2^1003921 is an apocalyptic number.

It is an amenable number.

1003921 is a deficient number, since it is larger than the sum of its proper divisors (52783).

1003921 is an equidigital number, since it uses as much as digits as its factorization.

1003921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 711.

The product of its (nonzero) digits is 54, while the sum is 16.

The square root of 1003921 is about 1001.9585819783. The cubic root of 1003921 is about 100.1305295462.

Adding to 1003921 its reverse (1293001), we get a palindrome (2296922).

The spelling of 1003921 in words is "one million, three thousand, nine hundred twenty-one".