403140640 has 72 divisors (see below), whose sum is σ = 1107938412. Its totient is φ = 138216960.

The previous prime is 403140611. The next prime is 403140653. The reversal of 403140640 is 46041304.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 403045776 + 94864 = 20076^2 + 308^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17871 + ... + 33550.

Almost surely, 2^403140640 is an apocalyptic number.

403140640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

403140640 is an abundant number, since it is smaller than the sum of its proper divisors (704797772).

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

403140640 is a wasteful number, since it uses less digits than its factorization.

403140640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51450 (or 51435 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 403140640 is about 20078.3624830313. The cubic root of 403140640 is about 738.7296441473.

Adding to 403140640 its reverse (46041304), we get a palindrome (449181944).

The spelling of 403140640 in words is "four hundred three million, one hundred forty thousand, six hundred forty".