1630665 has 32 divisors (see below), whose sum is σ = 2972160. Its totient is φ = 847872.

The previous prime is 1630663. The next prime is 1630669. The reversal of 1630665 is 5660361.

It is not a de Polignac number, because 1630665 - 2¹ = 1630663 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

1630665 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1630663) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6217 + ... + 6473.

It is an arithmetic number, because the mean of its divisors is an integer number (92880).

2^1630665 is an apocalyptic number.

1630665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1630665 is a deficient number, since it is larger than the sum of its proper divisors (1341495).

1630665 is a wasteful number, since it uses less digits than its factorization.

1630665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318 (or 312 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 1630665 is about 1276.9749410227. The cubic root of 1630665 is about 117.7031945094.

The spelling of 1630665 in words is "one million, six hundred thirty thousand, six hundred sixty-five".