1427661 has 24 divisors (see below), whose sum is σ = 2181816.
Its totient is φ = 898560.
The previous prime is 1427653. The next prime is 1427663. The reversal of 1427661 is 1667241.
It can be written as a sum of positive squares in 4 ways, for example, as 93636 + 1334025 = 306^2 + 1155^2
It is not a de Polignac number, because 1427661 - 23 = 1427653 is a prime.
It is a Curzon number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (1427663) 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, 19521 + ... + 19593.
It is an arithmetic number, because the mean of its divisors is an integer number (90909).
21427661 is an apocalyptic number.
It is an amenable number.
1427661 is a deficient number, since it is larger than the sum of its proper divisors (754155).
1427661 is a wasteful number, since it uses less digits than its factorization.
1427661 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 173 (or 170 counting only the distinct ones).
The product of its digits is 2016, while the sum is 27.
The square root of 1427661 is about 1194.8476890382.
The cubic root of 1427661 is about 112.6008577009.
The spelling of 1427661 in words is "one million, four hundred twenty-seven thousand, six hundred sixty-one".