1965021 has 8 divisors (see below), whose sum is σ = 2630784. Its totient is φ = 1304640.

The previous prime is 1964987. The next prime is 1965077. The reversal of 1965021 is 1205691.

1965021 is nontrivially palindromic in base 4.

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

It is not a de Polignac number, because 1965021 - 2¹⁴ = 1948637 is a prime.

It is a super-2 number, since 2×1965021² = 7722615060882, which contains 22 as substring.

1965021 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1964982 and 1965000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1965091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 396 + ... + 2021.

It is an arithmetic number, because the mean of its divisors is an integer number (328848).

2^1965021 is an apocalyptic number.

It is an amenable number.

1965021 is a deficient number, since it is larger than the sum of its proper divisors (665763).

1965021 is a wasteful number, since it uses less digits than its factorization.

1965021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2691.

The product of its (nonzero) digits is 540, while the sum is 24.

The square root of 1965021 is about 1401.7920673195. The cubic root of 1965021 is about 125.2532678300.

The spelling of 1965021 in words is "one million, nine hundred sixty-five thousand, twenty-one".