1018921 has 8 divisors (see below), whose sum is σ = 1050624. Its totient is φ = 987840.

The previous prime is 1018907. The next prime is 1018931. The reversal of 1018921 is 1298101.

1018921 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 3-Lehmer number, since φ(1018921) divides (1018921-1)³.

It is a cyclic number.

It is not a de Polignac number, because 1018921 - 2⁵ = 1018889 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1018892 and 1018901.

It is not an unprimeable number, because it can be changed into a prime (1018931) 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, 7960 + ... + 8086.

It is an arithmetic number, because the mean of its divisors is an integer number (131328).

It is a Poulet number, since it divides 2^1018920-1.

2^1018921 is an apocalyptic number.

It is an amenable number.

1018921 is a deficient number, since it is larger than the sum of its proper divisors (31703).

1018921 is a wasteful number, since it uses less digits than its factorization.

1018921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311.

The product of its (nonzero) digits is 144, while the sum is 22.

The square root of 1018921 is about 1009.4161678911. The cubic root of 1018921 is about 100.6267634684.

The spelling of 1018921 in words is "one million, eighteen thousand, nine hundred twenty-one".