1661230 has 16 divisors (see below), whose sum is σ = 3006144. Its totient is φ = 660960.

The previous prime is 1661173. The next prime is 1661237. The reversal of 1661230 is 321661.

It is a super-2 number, since 2×1661230² = 5519370225800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1661198 and 1661207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2404 + ... + 3016.

It is an arithmetic number, because the mean of its divisors is an integer number (187884).

2^1661230 is an apocalyptic number.

1661230 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1661230 is a deficient number, since it is larger than the sum of its proper divisors (1344914).

1661230 is a wasteful number, since it uses less digits than its factorization.

1661230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 891.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 1661230 is about 1288.8871168570. The cubic root of 1661230 is about 118.4340520969.

Adding to 1661230 its reverse (321661), we get a palindrome (1982891).

It can be divided in two parts, 1661 and 230, that added together give a triangular number (1891 = T₆₁).

The spelling of 1661230 in words is "one million, six hundred sixty-one thousand, two hundred thirty".