1630730 has 16 divisors (see below), whose sum is σ = 2950344. Its totient is φ = 648960.

The previous prime is 1630721. The next prime is 1630763. The reversal of 1630730 is 370361.

It is a Cunningham number, because it is equal to 1277²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 588289 + 1042441 = 767^2 + 1021^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2870 + ... + 3390.

2^1630730 is an apocalyptic number.

1630730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1630730 is a deficient number, since it is larger than the sum of its proper divisors (1319614).

1630730 is a wasteful number, since it uses less digits than its factorization.

1630730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 841.

The product of its (nonzero) digits is 378, while the sum is 20.

The square root of 1630730 is about 1277.0003915426. Note that the first 3 decimals coincide. The cubic root of 1630730 is about 117.7047584125.

The spelling of 1630730 in words is "one million, six hundred thirty thousand, seven hundred thirty".