1220432240 has 80 divisors (see below), whose sum is σ = 2919563136. Its totient is φ = 474163200.

The previous prime is 1220432231. The next prime is 1220432267. The reversal of 1220432240 is 422340221.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-3 number, since 3×1220432240³ (a number of 28 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 888194 + ... + 889566.

Almost surely, 2^1220432240 is an apocalyptic number.

1220432240 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 1220432240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1459781568).

1220432240 is an abundant number, since it is smaller than the sum of its proper divisors (1699130896).

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

1220432240 is a wasteful number, since it uses less digits than its factorization.

1220432240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1698 (or 1692 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 1220432240 is about 34934.6853427936. The cubic root of 1220432240 is about 1068.6559068582.

Adding to 1220432240 its reverse (422340221), we get a palindrome (1642772461).

It can be divided in two parts, 12204 and 32240, that added together give a palindrome (44444).

The spelling of 1220432240 in words is "one billion, two hundred twenty million, four hundred thirty-two thousand, two hundred forty".