408240128420 has 24 divisors (see below), whose sum is σ = 857364709824. Its totient is φ = 163284538976.

The previous prime is 408240128419. The next prime is 408240128437. The reversal of 408240128420 is 24821042804.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 425822 + ... + 998901.

It is an arithmetic number, because the mean of its divisors is an integer number (35723529576).

Almost surely, 2^408240128420 is an apocalyptic number.

It is an amenable number.

408240128420 is an abundant number, since it is smaller than the sum of its proper divisors (449124581404).

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

408240128420 is a wasteful number, since it uses less digits than its factorization.

408240128420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1439059 (or 1439057 counting only the distinct ones).

The product of its (nonzero) digits is 32768, while the sum is 35.

The spelling of 408240128420 in words is "four hundred eight billion, two hundred forty million, one hundred twenty-eight thousand, four hundred twenty".