320121520 has 40 divisors (see below), whose sum is σ = 751670640. Its totient is φ = 126777600.

The previous prime is 320121497. The next prime is 320121523. The reversal of 320121520 is 25121023.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×320121520² = 204955575134220800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 320121494 and 320121503.

It is not an unprimeable number, because it can be changed into a prime (320121523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11730 + ... + 27889.

It is an arithmetic number, because the mean of its divisors is an integer number (18791766).

Almost surely, 2^320121520 is an apocalyptic number.

It is an amenable number.

320121520 is an abundant number, since it is smaller than the sum of its proper divisors (431549120).

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

320121520 is a wasteful number, since it uses less digits than its factorization.

320121520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39733 (or 39727 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 320121520 is about 17891.9400848539. The cubic root of 320121520 is about 684.0769494953.

Adding to 320121520 its reverse (25121023), we get a palindrome (345242543).

The spelling of 320121520 in words is "three hundred twenty million, one hundred twenty-one thousand, five hundred twenty".