1630409 has 16 divisors (see below), whose sum is σ = 1944000. Its totient is φ = 1350720.

The previous prime is 1630403. The next prime is 1630411. The reversal of 1630409 is 9040361.

It is a cyclic number.

It is not a de Polignac number, because 1630409 - 2⁴ = 1630393 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 (1630403) 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, 5927 + ... + 6195.

It is an arithmetic number, because the mean of its divisors is an integer number (121500).

2^1630409 is an apocalyptic number.

1630409 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1630409 is a deficient number, since it is larger than the sum of its proper divisors (313591).

1630409 is a wasteful number, since it uses less digits than its factorization.

1630409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 1630409 is about 1276.8747001958. The cubic root of 1630409 is about 117.6970347332.

The spelling of 1630409 in words is "one million, six hundred thirty thousand, four hundred nine".