1431440406 has 144 divisors (see below), whose sum is σ = 3574050480. Its totient is φ = 413212800.

The previous prime is 1431440371. The next prime is 1431440419. The reversal of 1431440406 is 6040441341.

It is a self number, because there is not a number n which added to its sum of digits gives 1431440406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 8274136 + ... + 8274308.

It is an arithmetic number, because the mean of its divisors is an integer number (24819795).

Almost surely, 2^1431440406 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1431440406, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1787025240).

1431440406 is an abundant number, since it is smaller than the sum of its proper divisors (2142610074).

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

1431440406 is a wasteful number, since it uses less digits than its factorization.

1431440406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363 (or 349 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 1431440406 is about 37834.3812688935. The cubic root of 1431440406 is about 1127.0013182373.

Adding to 1431440406 its reverse (6040441341), we get a palindrome (7471881747).

The spelling of 1431440406 in words is "one billion, four hundred thirty-one million, four hundred forty thousand, four hundred six".