1630634 has 4 divisors (see below), whose sum is σ = 2445954. Its totient is φ = 815316.

The previous prime is 1630633. The next prime is 1630663. The reversal of 1630634 is 4360361.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4360361 = 157 ⋅27773.

It can be written as a sum of positive squares in only one way, i.e., 1555009 + 75625 = 1247^2 + 275^2 .

It is not an unprimeable number, because it can be changed into a prime (1630633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 407657 + ... + 407660.

2^1630634 is an apocalyptic number.

1630634 is a deficient number, since it is larger than the sum of its proper divisors (815320).

1630634 is an equidigital number, since it uses as much as digits as its factorization.

1630634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 815319.

The product of its (nonzero) digits is 1296, while the sum is 23.

The square root of 1630634 is about 1276.9628029038. The cubic root of 1630634 is about 117.7024486333.

Adding to 1630634 its reverse (4360361), we get a palindrome (5990995).

The spelling of 1630634 in words is "one million, six hundred thirty thousand, six hundred thirty-four".