408352640 has 32 divisors (see below), whose sum is σ = 976219560. Its totient is φ = 163340800.

The previous prime is 408352627. The next prime is 408352643. The reversal of 408352640 is 46253804.

It is a tau number, because it is divible by the number of its divisors (32).

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 408352597 and 408352606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (408352643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 318386 + ... + 319665.

Almost surely, 2^408352640 is an apocalyptic number.

408352640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

408352640 is an abundant number, since it is smaller than the sum of its proper divisors (567866920).

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

408352640 is an equidigital number, since it uses as much as digits as its factorization.

408352640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 638070 (or 638058 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 32.

The square root of 408352640 is about 20207.7371320987. The cubic root of 408352640 is about 741.8995754363.

The spelling of 408352640 in words is "four hundred eight million, three hundred fifty-two thousand, six hundred forty".