1630189 has 4 divisors (see below), whose sum is σ = 1778400. Its totient is φ = 1481980.

The previous prime is 1630169. The next prime is 1630193. The reversal of 1630189 is 9810361.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9810361 = 11 ⋅891851.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1630189 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1630129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74089 + ... + 74110.

It is an arithmetic number, because the mean of its divisors is an integer number (444600).

2^1630189 is an apocalyptic number.

It is an amenable number.

1630189 is a deficient number, since it is larger than the sum of its proper divisors (148211).

1630189 is a wasteful number, since it uses less digits than its factorization.

1630189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148210.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 1630189 is about 1276.7885494474. The cubic root of 1630189 is about 117.6917406602.

The spelling of 1630189 in words is "one million, six hundred thirty thousand, one hundred eighty-nine".