1218398546 has 4 divisors (see below), whose sum is σ = 1827597822. Its totient is φ = 609199272.

The previous prime is 1218398539. The next prime is 1218398563. The reversal of 1218398546 is 6458938121.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 1145484025 + 72914521 = 33845^2 + 8539^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1218398546.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 304599635 + ... + 304599638.

Almost surely, 2^1218398546 is an apocalyptic number.

1218398546 is a deficient number, since it is larger than the sum of its proper divisors (609199276).

1218398546 is an equidigital number, since it uses as much as digits as its factorization.

1218398546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 609199275.

The product of its digits is 414720, while the sum is 47.

The square root of 1218398546 is about 34905.5661177412. The cubic root of 1218398546 is about 1068.0619841098.

The spelling of 1218398546 in words is "one billion, two hundred eighteen million, three hundred ninety-eight thousand, five hundred forty-six".