1220649192 has 240 divisors, whose sum is σ = 4037473440. Its totient is φ = 332506944.

The previous prime is 1220649163. The next prime is 1220649217. The reversal of 1220649192 is 2919460221.

1220649192 is a `hidden beast` number, since 1 + 2 + 2 + 0 + 649 + 1 + 9 + 2 = 666.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 3975903 + ... + 3976209.

It is an arithmetic number, because the mean of its divisors is an integer number (16822806).

Almost surely, 2^1220649192 is an apocalyptic number.

1220649192 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 1220649192, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2018736720).

1220649192 is an abundant number, since it is smaller than the sum of its proper divisors (2816824248).

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

1220649192 is a wasteful number, since it uses less digits than its factorization.

1220649192 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 370 (or 342 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 1220649192 is about 34937.7903136418. The cubic root of 1220649192 is about 1068.7192268558.

The spelling of 1220649192 in words is "one billion, two hundred twenty million, six hundred forty-nine thousand, one hundred ninety-two".