1665201 has 16 divisors (see below), whose sum is σ = 2381184. Its totient is φ = 1031424.

The previous prime is 1665197. The next prime is 1665211. The reversal of 1665201 is 1025661.

It is a happy number.

It is not a de Polignac number, because 1665201 - 2² = 1665197 is a prime.

1665201 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1665211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5095 + ... + 5411.

It is an arithmetic number, because the mean of its divisors is an integer number (148824).

2^1665201 is an apocalyptic number.

It is an amenable number.

1665201 is a deficient number, since it is larger than the sum of its proper divisors (715983).

1665201 is a wasteful number, since it uses less digits than its factorization.

1665201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 1665201 is about 1290.4266736239. The cubic root of 1665201 is about 118.5283451572.

The spelling of 1665201 in words is "one million, six hundred sixty-five thousand, two hundred one".