1216023 has 4 divisors (see below), whose sum is σ = 1621368. Its totient is φ = 810680.

The previous prime is 1216021. The next prime is 1216043. The reversal of 1216023 is 3206121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3206121 = 3 ⋅1068707.

It is a cyclic number.

It is not a de Polignac number, because 1216023 - 2¹ = 1216021 is a prime.

It is a D-number.

It is a junction number, because it is equal to n+sod(n) for n = 1215993 and 1216011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216021) 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, 202668 + ... + 202673.

It is an arithmetic number, because the mean of its divisors is an integer number (405342).

2^1216023 is an apocalyptic number.

1216023 is a deficient number, since it is larger than the sum of its proper divisors (405345).

1216023 is an equidigital number, since it uses as much as digits as its factorization.

1216023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405344.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 1216023 is about 1102.7343288390. The cubic root of 1216023 is about 106.7367388968.

The spelling of 1216023 in words is "one million, two hundred sixteen thousand, twenty-three".