1670921 has 4 divisors (see below), whose sum is σ = 1909632. Its totient is φ = 1432212.

The previous prime is 1670899. The next prime is 1670923. The reversal of 1670921 is 1290761.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1670921 - 2⁶ = 1670857 is a prime.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1670923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 119345 + ... + 119358.

It is an arithmetic number, because the mean of its divisors is an integer number (477408).

2^1670921 is an apocalyptic number.

It is an amenable number.

1670921 is a deficient number, since it is larger than the sum of its proper divisors (238711).

1670921 is an equidigital number, since it uses as much as digits as its factorization.

1670921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238710.

The product of its (nonzero) digits is 756, while the sum is 26.

The square root of 1670921 is about 1292.6410948133. The cubic root of 1670921 is about 118.6639058329.

The spelling of 1670921 in words is "one million, six hundred seventy thousand, nine hundred twenty-one".