1969945 has 4 divisors (see below), whose sum is σ = 2363940. Its totient is φ = 1575952.

The previous prime is 1969921. The next prime is 1969949. The reversal of 1969945 is 5499691.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1420864 + 549081 = 1192^2 + 741^2 .

It is a cyclic number.

It is not a de Polignac number, because 1969945 - 2¹¹ = 1967897 is a prime.

It is a d-powerful number, because it can be written as 1 + 9³ + 6⁵ + 9³ + 9⁴ + 4⁵ + 5⁹ .

It is not an unprimeable number, because it can be changed into a prime (1969949) 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 3 ways as a sum of consecutive naturals, for example, 196990 + ... + 196999.

It is an arithmetic number, because the mean of its divisors is an integer number (590985).

2^1969945 is an apocalyptic number.

It is an amenable number.

1969945 is a deficient number, since it is larger than the sum of its proper divisors (393995).

1969945 is an equidigital number, since it uses as much as digits as its factorization.

1969945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393994.

The product of its digits is 87480, while the sum is 43.

The square root of 1969945 is about 1403.5472916863. The cubic root of 1969945 is about 125.3578015141.

The spelling of 1969945 in words is "one million, nine hundred sixty-nine thousand, nine hundred forty-five".