1660730 has 16 divisors (see below), whose sum is σ = 3165480. Its totient is φ = 625152.

The previous prime is 1660727. The next prime is 1660739. The reversal of 1660730 is 370661.

It can be written as a sum of positive squares in 4 ways, for example, as 1413721 + 247009 = 1189^2 + 497^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1660696 and 1660705.

It is not an unprimeable number, because it can be changed into a prime (1660739) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4715 + ... + 5054.

2^1660730 is an apocalyptic number.

1660730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1660730 is a deficient number, since it is larger than the sum of its proper divisors (1504750).

1660730 is a wasteful number, since it uses less digits than its factorization.

1660730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9793.

The product of its (nonzero) digits is 756, while the sum is 23.

The square root of 1660730 is about 1288.6931364759. The cubic root of 1660730 is about 118.4221687398.

Adding to 1660730 its sum of digits (23), we get a triangular number (1660753 = T₁₈₂₂).

The spelling of 1660730 in words is "one million, six hundred sixty thousand, seven hundred thirty".