1218220452 has 24 divisors (see below), whose sum is σ = 3158349600. Its totient is φ = 406073448.

The previous prime is 1218220433. The next prime is 1218220453. The reversal of 1218220452 is 2540228121.

1218220452 is a `hidden beast` number, since 12 + 182 + 20 + 452 = 666.

It is a super-2 number, since 2×1218220452² = 2968122139342168608, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1218220453) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5639802 + ... + 5640017.

It is an arithmetic number, because the mean of its divisors is an integer number (131597900).

Almost surely, 2^1218220452 is an apocalyptic number.

1218220452 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1218220452 is an abundant number, since it is smaller than the sum of its proper divisors (1940129148).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1218220452 is a wasteful number, since it uses less digits than its factorization.

1218220452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11279832 (or 11279824 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 27.

The square root of 1218220452 is about 34903.0149414058. The cubic root of 1218220452 is about 1068.0099418340.

Adding to 1218220452 its reverse (2540228121), we get a palindrome (3758448573).

The spelling of 1218220452 in words is "one billion, two hundred eighteen million, two hundred twenty thousand, four hundred fifty-two".