1401441640 has 32 divisors (see below), whose sum is σ = 3160771560. Its totient is φ = 559238400.

The previous prime is 1401441581. The next prime is 1401441647. The reversal of 1401441640 is 461441041.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 630712996 + 770728644 = 25114^2 + 27762^2 .

It is not an unprimeable number, because it can be changed into a prime (1401441647) 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, 24771 + ... + 58450.

Almost surely, 2^1401441640 is an apocalyptic number.

1401441640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1401441640 is an abundant number, since it is smaller than the sum of its proper divisors (1759329920).

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

1401441640 is a wasteful number, since it uses less digits than its factorization.

1401441640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83653 (or 83649 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 1401441640 is about 37435.8336357026. The cubic root of 1401441640 is about 1119.0727976698.

Adding to 1401441640 its reverse (461441041), we get a palindrome (1862882681).

The spelling of 1401441640 in words is "one billion, four hundred one million, four hundred forty-one thousand, six hundred forty".