1090921 has 8 divisors (see below), whose sum is σ = 1213184. Its totient is φ = 974160.

The previous prime is 1090919. The next prime is 1090927. The reversal of 1090921 is 1290901.

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 1090921 - 2¹ = 1090919 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 = 1090892 and 1090901.

It is not an unprimeable number, because it can be changed into a prime (1090927) 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, 951 + ... + 1756.

It is an arithmetic number, because the mean of its divisors is an integer number (151648).

2^1090921 is an apocalyptic number.

It is an amenable number.

1090921 is a deficient number, since it is larger than the sum of its proper divisors (122263).

1090921 is a wasteful number, since it uses less digits than its factorization.

1090921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2751.

The product of its (nonzero) digits is 162, while the sum is 22.

The square root of 1090921 is about 1044.4716367619. The cubic root of 1090921 is about 102.9432244362.

The spelling of 1090921 in words is "one million, ninety thousand, nine hundred twenty-one".