403496640 has 168 divisors, whose sum is σ = 1439539920. Its totient is φ = 107578368.

The previous prime is 403496591. The next prime is 403496657. The reversal of 403496640 is 46694304.

403496640 is a `hidden beast` number, since 4 + 0 + 3 + 4 + 9 + 6 + 640 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 403496595 and 403496604.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 75166 + ... + 80354.

It is an arithmetic number, because the mean of its divisors is an integer number (8568690).

Almost surely, 2^403496640 is an apocalyptic number.

403496640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 403496640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (719769960).

403496640 is an abundant number, since it is smaller than the sum of its proper divisors (1036043280).

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

403496640 is an equidigital number, since it uses as much as digits as its factorization.

403496640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5221 (or 5199 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 36.

The square root of 403496640 is about 20087.2257915323. The cubic root of 403496640 is about 738.9470293088.

The spelling of 403496640 in words is "four hundred three million, four hundred ninety-six thousand, six hundred forty".