1630989594 has 120 divisors (see below), whose sum is σ = 4056686172. Its totient is φ = 489265920.

The previous prime is 1630989589. The next prime is 1630989599. The reversal of 1630989594 is 4959890361.

1630989594 is a `hidden beast` number, since 16 + 30 + 9 + 8 + 9 + 594 = 666.

It is an interprime number because it is at equal distance from previous prime (1630989589) and next prime (1630989599).

It can be written as a sum of positive squares in 6 ways, for example, as 279324369 + 1351665225 = 16713^2 + 36765^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 1630989594.

It is not an unprimeable number, because it can be changed into a prime (1630989599) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 1121772 + ... + 1123224.

Almost surely, 2^1630989594 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1630989594, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2028343086).

1630989594 is an abundant number, since it is smaller than the sum of its proper divisors (2425696578).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1630989594 is a wasteful number, since it uses less digits than its factorization.

1630989594 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1534 (or 1512 counting only the distinct ones).

The product of its (nonzero) digits is 2099520, while the sum is 54.

The square root of 1630989594 is about 40385.5121794933. The cubic root of 1630989594 is about 1177.1100384202.

The spelling of 1630989594 in words is "one billion, six hundred thirty million, nine hundred eighty-nine thousand, five hundred ninety-four".