1661274 has 48 divisors (see below), whose sum is σ = 3917160. Its totient is φ = 506880.

The previous prime is 1661273. The next prime is 1661281. The reversal of 1661274 is 4721661.

1661274 = T₁₄₇ + T₁₄₈ + ... + T₂₃₅.

It can be written as a sum of positive squares in 4 ways, for example, as 950625 + 710649 = 975^2 + 843^2 .

It is not an unprimeable number, because it can be changed into a prime (1661273) 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 23 ways as a sum of consecutive naturals, for example, 18622 + ... + 18710.

2^1661274 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1661274, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1958580).

1661274 is an abundant number, since it is smaller than the sum of its proper divisors (2255886).

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

1661274 is a wasteful number, since it uses less digits than its factorization.

1661274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175 (or 172 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 1661274 is about 1288.9041857330. The cubic root of 1661274 is about 118.4350977182.

The spelling of 1661274 in words is "one million, six hundred sixty-one thousand, two hundred seventy-four".