1669421 has 8 divisors (see below), whose sum is σ = 1808184. Its totient is φ = 1532160.

The previous prime is 1669399. The next prime is 1669427. The reversal of 1669421 is 1249661.

It can be written as a sum of positive squares in 4 ways, for example, as 372100 + 1297321 = 610^2 + 1139^2 .

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 1669421 - 2⁶ = 1669357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1669427) 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, 3425 + ... + 3881.

It is an arithmetic number, because the mean of its divisors is an integer number (226023).

2^1669421 is an apocalyptic number.

It is an amenable number.

1669421 is a deficient number, since it is larger than the sum of its proper divisors (138763).

1669421 is a wasteful number, since it uses less digits than its factorization.

1669421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 751.

The product of its digits is 2592, while the sum is 29.

The square root of 1669421 is about 1292.0607570854. The cubic root of 1669421 is about 118.6283866695.

The spelling of 1669421 in words is "one million, six hundred sixty-nine thousand, four hundred twenty-one".