1023965 has 4 divisors (see below), whose sum is σ = 1228764. Its totient is φ = 819168.

The previous prime is 1023949. The next prime is 1023973. The reversal of 1023965 is 5693201.

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 502681 + 521284 = 709^2 + 722^2 .

It is a cyclic number.

It is not a de Polignac number, because 1023965 - 2⁴ = 1023949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102392 + ... + 102401.

It is an arithmetic number, because the mean of its divisors is an integer number (307191).

2^1023965 is an apocalyptic number.

It is an amenable number.

1023965 is a deficient number, since it is larger than the sum of its proper divisors (204799).

1023965 is an equidigital number, since it uses as much as digits as its factorization.

1023965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204798.

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 1023965 is about 1011.9115574002. The cubic root of 1023965 is about 100.7925356130.

The spelling of 1023965 in words is "one million, twenty-three thousand, nine hundred sixty-five".