1660427 has 4 divisors (see below), whose sum is σ = 1664136. Its totient is φ = 1656720.

The previous prime is 1660423. The next prime is 1660433. The reversal of 1660427 is 7240661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7240661 = 1109 ⋅6529.

It is a cyclic number.

It is not a de Polignac number, because 1660427 - 2² = 1660423 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1660396 and 1660405.

It is not an unprimeable number, because it can be changed into a prime (1660423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1073 + ... + 2114.

It is an arithmetic number, because the mean of its divisors is an integer number (416034).

2^1660427 is an apocalyptic number.

1660427 is a deficient number, since it is larger than the sum of its proper divisors (3709).

1660427 is an equidigital number, since it uses as much as digits as its factorization.

1660427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3708.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 1660427 is about 1288.5755701549. The cubic root of 1660427 is about 118.4149662646.

The spelling of 1660427 in words is "one million, six hundred sixty thousand, four hundred twenty-seven".