1660726 has 4 divisors (see below), whose sum is σ = 2491092. Its totient is φ = 830362.

The previous prime is 1660723. The next prime is 1660727. The reversal of 1660726 is 6270661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6270661 = 109 ⋅57529.

It is a junction number, because it is equal to n+sod(n) for n = 1660694 and 1660703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1660721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 415180 + ... + 415183.

It is an arithmetic number, because the mean of its divisors is an integer number (622773).

2^1660726 is an apocalyptic number.

1660726 is a deficient number, since it is larger than the sum of its proper divisors (830366).

1660726 is an equidigital number, since it uses as much as digits as its factorization.

1660726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 830365.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 1660726 is about 1288.6915845151. The cubic root of 1660726 is about 118.4220736633.

The spelling of 1660726 in words is "one million, six hundred sixty thousand, seven hundred twenty-six".