406432321320 has 64 divisors (see below), whose sum is σ = 1219543254720. Its totient is φ = 108360059904.

The previous prime is 406432321303. The next prime is 406432321331. The reversal of 406432321320 is 23123234604.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 258864 + ... + 938016.

It is an arithmetic number, because the mean of its divisors is an integer number (19055363355).

Almost surely, 2^406432321320 is an apocalyptic number.

406432321320 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

406432321320 is an abundant number, since it is smaller than the sum of its proper divisors (813110933400).

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

406432321320 is a wasteful number, since it uses less digits than its factorization.

406432321320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 684154 (or 684150 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 30.

Adding to 406432321320 its reverse (23123234604), we get a palindrome (429555555924).

The spelling of 406432321320 in words is "four hundred six billion, four hundred thirty-two million, three hundred twenty-one thousand, three hundred twenty".