1801969 has 8 divisors (see below), whose sum is σ = 1961960. Its totient is φ = 1645056.

The previous prime is 1801967. The next prime is 1801997. The reversal of 1801969 is 9691081.

It can be written as a sum of positive squares in 4 ways, for example, as 14400 + 1787569 = 120^2 + 1337^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1801969 - 2¹ = 1801967 is a prime.

It is a super-2 number, since 2×1801969² = 6494184553922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1801967) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 547 + ... + 1975.

It is an arithmetic number, because the mean of its divisors is an integer number (245245).

It is a Poulet number, since it divides 2^1801968-1.

2^1801969 is an apocalyptic number.

It is an amenable number.

1801969 is a deficient number, since it is larger than the sum of its proper divisors (159991).

1801969 is a wasteful number, since it uses less digits than its factorization.

1801969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1539.

The product of its (nonzero) digits is 3888, while the sum is 34.

The square root of 1801969 is about 1342.3743889094. The cubic root of 1801969 is about 121.6883787694.

The spelling of 1801969 in words is "one million, eight hundred one thousand, nine hundred sixty-nine".