921606 has 16 divisors (see below), whose sum is σ = 2106624. Its totient is φ = 263304.

The previous prime is 921601. The next prime is 921611. The reversal of 921606 is 606129.

It is an interprime number because it is at equal distance from previous prime (921601) and next prime (921611).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (921601) by changing a digit.

921606 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10930 + ... + 11013.

It is an arithmetic number, because the mean of its divisors is an integer number (131664).

921606 is a Friedman number, since it can be written as (96*10)^2+6, using all its digits and the basic arithmetic operations.

2⁹²¹⁶⁰⁶ is an apocalyptic number.

921606 is an abundant number, since it is smaller than the sum of its proper divisors (1185018).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

921606 is a wasteful number, since it uses less digits than its factorization.

921606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21955.

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 921606 is about 960.0031249949. The cubic root of 921606 is about 97.3154431163.

The spelling of 921606 in words is "nine hundred twenty-one thousand, six hundred six".