1220186240 has 384 divisors, whose sum is σ = 3794681520. Its totient is φ = 371589120.

The previous prime is 1220186239. The next prime is 1220186243. The reversal of 1220186240 is 426810221.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 87459904 + 1132726336 = 9352^2 + 33656^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

It is not an unprimeable number, because it can be changed into a prime (1220186243) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 16714844 + ... + 16714916.

Almost surely, 2^1220186240 is an apocalyptic number.

1220186240 is a gapful number since it is divisible by the number (10) 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 1220186240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1897340760).

1220186240 is an abundant number, since it is smaller than the sum of its proper divisors (2574495280).

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

1220186240 is a wasteful number, since it uses less digits than its factorization.

1220186240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160 (or 141 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 1220186240 is about 34931.1643092526. The cubic root of 1220186240 is about 1068.5840997804.

Adding to 1220186240 its reverse (426810221), we get a palindrome (1646996461).

The spelling of 1220186240 in words is "one billion, two hundred twenty million, one hundred eighty-six thousand, two hundred forty".