1218571452 has 90 divisors (see below), whose sum is σ = 3645643848. Its totient is φ = 347688288.

The previous prime is 1218571451. The next prime is 1218571463. The reversal of 1218571452 is 2541758121.

It is a happy number.

1218571452 is a `hidden beast` number, since 121 + 85 + 7 + 1 + 452 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1218571451) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 1662078 + ... + 1662810.

Almost surely, 2^1218571452 is an apocalyptic number.

1218571452 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1218571452, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1822821924).

1218571452 is an abundant number, since it is smaller than the sum of its proper divisors (2427072396).

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

1218571452 is an frugal number, since it uses more digits than its factorization.

1218571452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1489 (or 745 counting only the distinct ones).

The product of its digits is 22400, while the sum is 36.

The square root of 1218571452 is about 34908.0427981862. The cubic root of 1218571452 is about 1068.1125055069.

The spelling of 1218571452 in words is "one billion, two hundred eighteen million, five hundred seventy-one thousand, four hundred fifty-two".