1216503 has 12 divisors (see below), whose sum is σ = 1860768. Its totient is φ = 763200.

The previous prime is 1216489. The next prime is 1216507. The reversal of 1216503 is 3056121.

1216503 is a `hidden beast` number, since 12 + 1 + 650 + 3 = 666.

It is not a de Polignac number, because 1216503 - 2¹⁷ = 1085431 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216507) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3823 + ... + 4128.

It is an arithmetic number, because the mean of its divisors is an integer number (155064).

2^1216503 is an apocalyptic number.

1216503 is a deficient number, since it is larger than the sum of its proper divisors (644265).

1216503 is a wasteful number, since it uses less digits than its factorization.

1216503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7974 (or 7971 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 1216503 is about 1102.9519481827. The cubic root of 1216503 is about 106.7507810915.

The spelling of 1216503 in words is "one million, two hundred sixteen thousand, five hundred three".