403660 has 12 divisors (see below), whose sum is σ = 847728. Its totient is φ = 161456.

The previous prime is 403649. The next prime is 403661. The reversal of 403660 is 66304.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (403661) by changing a digit.

403660 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10072 + ... + 10111.

It is an arithmetic number, because the mean of its divisors is an integer number (70644).

2⁴⁰³⁶⁶⁰ is an apocalyptic number.

It is an amenable number.

403660 is an abundant number, since it is smaller than the sum of its proper divisors (444068).

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

403660 is a wasteful number, since it uses less digits than its factorization.

403660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20192 (or 20190 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 403660 is about 635.3424273571. The cubic root of 403660 is about 73.9046739432.

Adding to 403660 its reverse (66304), we get a palindrome (469964).

It can be divided in two parts, 4036 and 60, that added together give a 12-th power (4096 = 2¹²).

The spelling of 403660 in words is "four hundred three thousand, six hundred sixty".