1630605 has 8 divisors (see below), whose sum is σ = 2608992. Its totient is φ = 869648.

The previous prime is 1630597. The next prime is 1630619. The reversal of 1630605 is 5060361.

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 1630605 - 2³ = 1630597 is a prime.

It is a Curzon number.

It is a plaindrome in base 12.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54339 + ... + 54368.

It is an arithmetic number, because the mean of its divisors is an integer number (326124).

2^1630605 is an apocalyptic number.

1630605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1630605 is a deficient number, since it is larger than the sum of its proper divisors (978387).

1630605 is a wasteful number, since it uses less digits than its factorization.

1630605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108715.

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 1630605 is about 1276.9514477849. The cubic root of 1630605 is about 117.7017508697.

Adding to 1630605 its reverse (5060361), we get a palindrome (6690966).

The spelling of 1630605 in words is "one million, six hundred thirty thousand, six hundred five".