1431731440 has 40 divisors (see below), whose sum is σ = 3406197168. Its totient is φ = 559372800.

The previous prime is 1431731423. The next prime is 1431731467. The reversal of 1431731440 is 441371341.

It is a tau number, because it is divible by the number of its divisors (40).

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1431731399 and 1431731408.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 204661 + ... + 211540.

Almost surely, 2^1431731440 is an apocalyptic number.

1431731440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1431731440 is an abundant number, since it is smaller than the sum of its proper divisors (1974465728).

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

1431731440 is a wasteful number, since it uses less digits than its factorization.

1431731440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416257 (or 416251 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 1431731440 is about 37838.2272312010. The cubic root of 1431731440 is about 1127.0776920013.

The spelling of 1431731440 in words is "one billion, four hundred thirty-one million, seven hundred thirty-one thousand, four hundred forty".