1220932440 has 640 divisors, whose sum is σ = 5225109120. Its totient is φ = 248832000.

The previous prime is 1220932387. The next prime is 1220932441. The reversal of 1220932440 is 442390221.

1220932440 is a `hidden beast` number, since 12 + 209 + 3 + 2 + 440 = 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 (1220932441) by changing a digit.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 12088390 + ... + 12088490.

It is an arithmetic number, because the mean of its divisors is an integer number (8164233).

Almost surely, 2^1220932440 is an apocalyptic number.

1220932440 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 1220932440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2612554560).

1220932440 is an abundant number, since it is smaller than the sum of its proper divisors (4004176680).

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

1220932440 is a wasteful number, since it uses less digits than its factorization.

1220932440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185 (or 172 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 1220932440 is about 34941.8436834693. The cubic root of 1220932440 is about 1068.8018848310.

The spelling of 1220932440 in words is "one billion, two hundred twenty million, nine hundred thirty-two thousand, four hundred forty".