1431640240 has 40 divisors (see below), whose sum is σ = 3391376688. Its totient is φ = 561849600.

The previous prime is 1431640213. The next prime is 1431640241. The reversal of 1431640240 is 420461341.

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

It is not an unprimeable number, because it can be changed into a prime (1431640241) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 164586 + ... + 173065.

Almost surely, 2^1431640240 is an apocalyptic number.

1431640240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1431640240 is an abundant number, since it is smaller than the sum of its proper divisors (1959736448).

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

1431640240 is a wasteful number, since it uses less digits than its factorization.

1431640240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337717 (or 337711 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 1431640240 is about 37837.0220815539. The cubic root of 1431640240 is about 1127.0537602160.

The spelling of 1431640240 in words is "one billion, four hundred thirty-one million, six hundred forty thousand, two hundred forty".