1200432440 has 128 divisors (see below), whose sum is σ = 2891185920. Its totient is φ = 447897600.

The previous prime is 1200432439. The next prime is 1200432449. The reversal of 1200432440 is 442340021.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200432449) 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, 4429505 + ... + 4429775.

It is an arithmetic number, because the mean of its divisors is an integer number (22587390).

Almost surely, 2^1200432440 is an apocalyptic number.

1200432440 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 1200432440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1445592960).

1200432440 is an abundant number, since it is smaller than the sum of its proper divisors (1690753480).

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

1200432440 is a wasteful number, since it uses less digits than its factorization.

1200432440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433 (or 429 counting only the distinct ones).

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

The square root of 1200432440 is about 34647.2573229109. The cubic root of 1200432440 is about 1062.7862027610.

Adding to 1200432440 its reverse (442340021), we get a palindrome (1642772461).

It can be divided in two parts, 12004 and 32440, that added together give a palindrome (44444).

The spelling of 1200432440 in words is "one billion, two hundred million, four hundred thirty-two thousand, four hundred forty".