1421609 has 16 divisors (see below), whose sum is σ = 1728000. Its totient is φ = 1143744.

The previous prime is 1421603. The next prime is 1421611. The reversal of 1421609 is 9061241.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-1421609 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1421603) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9467 + ... + 9615.

It is an arithmetic number, because the mean of its divisors is an integer number (108000).

2^1421609 is an apocalyptic number.

It is an amenable number.

1421609 is a deficient number, since it is larger than the sum of its proper divisors (306391).

1421609 is a wasteful number, since it uses less digits than its factorization.

1421609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 1421609 is about 1192.3124590475. The cubic root of 1421609 is about 112.4415235192.

The spelling of 1421609 in words is "one million, four hundred twenty-one thousand, six hundred nine".