1216404494 has 4 divisors (see below), whose sum is σ = 1824606744. Its totient is φ = 608202246.

The previous prime is 1216404487. The next prime is 1216404499. The reversal of 1216404494 is 4944046121.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216404499) 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 as a sum of consecutive naturals, namely, 304101122 + ... + 304101125.

It is an arithmetic number, because the mean of its divisors is an integer number (456151686).

Almost surely, 2^1216404494 is an apocalyptic number.

1216404494 is a deficient number, since it is larger than the sum of its proper divisors (608202250).

1216404494 is an equidigital number, since it uses as much as digits as its factorization.

1216404494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 608202249.

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 1216404494 is about 34876.9908965782. The cubic root of 1216404494 is about 1067.4789964185.

The spelling of 1216404494 in words is "one billion, two hundred sixteen million, four hundred four thousand, four hundred ninety-four".