320540129 has 16 divisors (see below), whose sum is σ = 395015040. Its totient is φ = 253290240.

The previous prime is 320540119. The next prime is 320540137. The reversal of 320540129 is 921045023.

It is not a de Polignac number, because 320540129 - 2⁴ = 320540113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 320540098 and 320540107.

It is not an unprimeable number, because it can be changed into a prime (320540119) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90074 + ... + 93564.

It is an arithmetic number, because the mean of its divisors is an integer number (24688440).

Almost surely, 2^320540129 is an apocalyptic number.

It is an amenable number.

320540129 is a deficient number, since it is larger than the sum of its proper divisors (74474911).

320540129 is a wasteful number, since it uses less digits than its factorization.

320540129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4520.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 320540129 is about 17903.6345192813. The cubic root of 320540129 is about 684.3749988505.

It can be divided in two parts, 3205 and 40129, that added together give a palindrome (43334).

The spelling of 320540129 in words is "three hundred twenty million, five hundred forty thousand, one hundred twenty-nine".