1220153652 has 96 divisors (see below), whose sum is σ = 3246243840. Its totient is φ = 396148320.

The previous prime is 1220153621. The next prime is 1220153653. The reversal of 1220153652 is 2563510221.

It is a happy number.

1220153652 is a `hidden beast` number, since 1 + 2 + 2 + 0 + 1 + 5 + 3 + 652 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220153653) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1375153 + ... + 1376039.

It is an arithmetic number, because the mean of its divisors is an integer number (33815040).

Almost surely, 2^1220153652 is an apocalyptic number.

1220153652 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 1220153652, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1623121920).

1220153652 is an abundant number, since it is smaller than the sum of its proper divisors (2026090188).

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

1220153652 is a wasteful number, since it uses less digits than its factorization.

1220153652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1218 (or 1210 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 1220153652 is about 34930.6978458776. The cubic root of 1220153652 is about 1068.5745866620.

Adding to 1220153652 its reverse (2563510221), we get a palindrome (3783663873).

The spelling of 1220153652 in words is "one billion, two hundred twenty million, one hundred fifty-three thousand, six hundred fifty-two".