1431212240 has 80 divisors (see below), whose sum is σ = 3518137920. Its totient is φ = 539965440.

The previous prime is 1431212197. The next prime is 1431212261. The reversal of 1431212240 is 422121341.

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

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 pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 364367 + ... + 368273.

It is an arithmetic number, because the mean of its divisors is an integer number (43976724).

Almost surely, 2^1431212240 is an apocalyptic number.

1431212240 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 1431212240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1759068960).

1431212240 is an abundant number, since it is smaller than the sum of its proper divisors (2086925680).

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

1431212240 is a wasteful number, since it uses less digits than its factorization.

1431212240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4180 (or 4174 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 1431212240 is about 37831.3658225552. The cubic root of 1431212240 is about 1126.9414351886.

Adding to 1431212240 its reverse (422121341), we get a palindrome (1853333581).

The spelling of 1431212240 in words is "one billion, four hundred thirty-one million, two hundred twelve thousand, two hundred forty".