1965421 has 4 divisors (see below), whose sum is σ = 2081052. Its totient is φ = 1849792.

The previous prime is 1965413. The next prime is 1965427. The reversal of 1965421 is 1245691.

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 1729225 + 236196 = 1315^2 + 486^2 .

It is a cyclic number.

It is not a de Polignac number, because 1965421 - 2³ = 1965413 is a prime.

It is a Duffinian number.

1965421 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1965421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1965427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57790 + ... + 57823.

It is an arithmetic number, because the mean of its divisors is an integer number (520263).

2^1965421 is an apocalyptic number.

It is an amenable number.

1965421 is a deficient number, since it is larger than the sum of its proper divisors (115631).

1965421 is a wasteful number, since it uses less digits than its factorization.

1965421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115630.

The product of its digits is 2160, while the sum is 28.

The square root of 1965421 is about 1401.9347345722. The cubic root of 1965421 is about 125.2617661120.

The spelling of 1965421 in words is "one million, nine hundred sixty-five thousand, four hundred twenty-one".