1405240140 has 24 divisors (see below), whose sum is σ = 3934672560. Its totient is φ = 374730688.

The previous prime is 1405240121. The next prime is 1405240159. The reversal of 1405240140 is 410425041.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1405240121) and next prime (1405240159).

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 7 ways as a sum of consecutive naturals, for example, 11710275 + ... + 11710394.

It is an arithmetic number, because the mean of its divisors is an integer number (163944690).

Almost surely, 2^1405240140 is an apocalyptic number.

1405240140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1405240140 is an abundant number, since it is smaller than the sum of its proper divisors (2529432420).

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

1405240140 is a wasteful number, since it uses less digits than its factorization.

1405240140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23420681 (or 23420679 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 1405240140 is about 37486.5327817871. The cubic root of 1405240140 is about 1120.0829392236.

Adding to 1405240140 its reverse (410425041), we get a palindrome (1815665181).

The spelling of 1405240140 in words is "one billion, four hundred five million, two hundred forty thousand, one hundred forty".