1601965 has 8 divisors (see below), whose sum is σ = 1967328. Its totient is φ = 1251600.

The previous prime is 1601953. The next prime is 1601969. The reversal of 1601965 is 5691061.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1601965 - 2¹³ = 1593773 is a prime.

It is a super-3 number, since 3×1601965³ = 12333329224401921375, which contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

1601965 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1601969) 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 7 ways as a sum of consecutive naturals, for example, 3511 + ... + 3940.

It is an arithmetic number, because the mean of its divisors is an integer number (245916).

2^1601965 is an apocalyptic number.

It is an amenable number.

1601965 is a deficient number, since it is larger than the sum of its proper divisors (365363).

1601965 is an equidigital number, since it uses as much as digits as its factorization.

1601965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7499.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 1601965 is about 1265.6875601822. The cubic root of 1601965 is about 117.0085707311.

The spelling of 1601965 in words is "one million, six hundred one thousand, nine hundred sixty-five".