1320400424 has 32 divisors (see below), whose sum is σ = 2831086080. Its totient is φ = 565554624.

The previous prime is 1320400379. The next prime is 1320400439. The reversal of 1320400424 is 4240040231.

It is a junction number, because it is equal to n+sod(n) for n = 1320400396 and 1320400405.

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, 105929 + ... + 117735.

It is an arithmetic number, because the mean of its divisors is an integer number (88471440).

Almost surely, 2^1320400424 is an apocalyptic number.

1320400424 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1320400424 is an abundant number, since it is smaller than the sum of its proper divisors (1510685656).

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

1320400424 is a wasteful number, since it uses less digits than its factorization.

1320400424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13817 (or 13813 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 1320400424 is about 36337.3144852506. The cubic root of 1320400424 is about 1097.0722208975.

Adding to 1320400424 its reverse (4240040231), we get a palindrome (5560440655).

The spelling of 1320400424 in words is "one billion, three hundred twenty million, four hundred thousand, four hundred twenty-four".