1220739432 has 64 divisors (see below), whose sum is σ = 3369461760. Its totient is φ = 365457600.

The previous prime is 1220739391. The next prime is 1220739433. The reversal of 1220739432 is 2349370221.

It is a super-3 number, since 3×1220739432³ (a number of 28 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 1220739393 and 1220739402.

It is not an unprimeable number, because it can be changed into a prime (1220739433) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5944 + ... + 49767.

It is an arithmetic number, because the mean of its divisors is an integer number (52647840).

Almost surely, 2^1220739432 is an apocalyptic number.

1220739432 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 1220739432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1684730880).

1220739432 is an abundant number, since it is smaller than the sum of its proper divisors (2148722328).

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

1220739432 is a wasteful number, since it uses less digits than its factorization.

1220739432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55814 (or 55810 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 33.

The square root of 1220739432 is about 34939.0817280592. The cubic root of 1220739432 is about 1068.7455622537.

The spelling of 1220739432 in words is "one billion, two hundred twenty million, seven hundred thirty-nine thousand, four hundred thirty-two".