1216047 has 16 divisors (see below), whose sum is σ = 1879040. Its totient is φ = 685152.

The previous prime is 1216043. The next prime is 1216067. The reversal of 1216047 is 7406121.

It is not a de Polignac number, because 1216047 - 2² = 1216043 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1293 + ... + 2025.

It is an arithmetic number, because the mean of its divisors is an integer number (117440).

2^1216047 is an apocalyptic number.

1216047 is a deficient number, since it is larger than the sum of its proper divisors (662993).

1216047 is an equidigital number, since it uses as much as digits as its factorization.

1216047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 822.

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 1216047 is about 1102.7452108261. The cubic root of 1216047 is about 106.7374410943.

The spelling of 1216047 in words is "one million, two hundred sixteen thousand, forty-seven".