1660071 has 24 divisors (see below), whose sum is σ = 2692224. Its totient is φ = 905520.

The previous prime is 1660069. The next prime is 1660073. The reversal of 1660071 is 1700661.

It is an interprime number because it is at equal distance from previous prime (1660069) and next prime (1660073).

It is not a de Polignac number, because 1660071 - 2¹ = 1660069 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1660073) 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, 3136 + ... + 3626.

It is an arithmetic number, because the mean of its divisors is an integer number (112176).

2^1660071 is an apocalyptic number.

1660071 is a deficient number, since it is larger than the sum of its proper divisors (1032153).

1660071 is a wasteful number, since it uses less digits than its factorization.

1660071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 531 (or 524 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 21.

The square root of 1660071 is about 1288.4374257216. The cubic root of 1660071 is about 118.4065028310.

The spelling of 1660071 in words is "one million, six hundred sixty thousand, seventy-one".