1630889 has 4 divisors (see below), whose sum is σ = 1756356. Its totient is φ = 1505424.

The previous prime is 1630859. The next prime is 1630891. The reversal of 1630889 is 9880361.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9880361 = 19 ⋅520019.

It can be written as a sum of positive squares in 2 ways, for example, as 403225 + 1227664 = 635^2 + 1108^2 .

It is a cyclic number.

It is not a de Polignac number, because 1630889 - 2⁸ = 1630633 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (1630829) 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, 62714 + ... + 62739.

It is an arithmetic number, because the mean of its divisors is an integer number (439089).

2^1630889 is an apocalyptic number.

It is an amenable number.

1630889 is a deficient number, since it is larger than the sum of its proper divisors (125467).

1630889 is a wasteful number, since it uses less digits than its factorization.

1630889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125466.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 1630889 is about 1277.0626452919. The cubic root of 1630889 is about 117.7085837849.

The spelling of 1630889 in words is "one million, six hundred thirty thousand, eight hundred eighty-nine".