1661212 has 24 divisors (see below), whose sum is σ = 3368960. Its totient is φ = 702000.

The previous prime is 1661173. The next prime is 1661237. The reversal of 1661212 is 2121661.

It is a zygodrome in base 6.

It is a self number, because there is not a number n which added to its sum of digits gives 1661212.

It is a congruent number.

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, 1837 + ... + 2587.

2^1661212 is an apocalyptic number.

It is an amenable number.

1661212 is an abundant number, since it is smaller than the sum of its proper divisors (1707748).

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

1661212 is a wasteful number, since it uses less digits than its factorization.

1661212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 841 (or 839 counting only the distinct ones).

The product of its digits is 144, while the sum is 19.

The square root of 1661212 is about 1288.8801340699. The cubic root of 1661212 is about 118.4336243374.

Adding to 1661212 its reverse (2121661), we get a palindrome (3782873).

It can be divided in two parts, 166 and 1212, that added together give a triangular number (1378 = T₅₂).

The spelling of 1661212 in words is "one million, six hundred sixty-one thousand, two hundred twelve".