423240 has 32 divisors (see below), whose sum is σ = 1270080. Its totient is φ = 112832.

The previous prime is 423233. The next prime is 423251. The reversal of 423240 is 42324.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

423240 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 7 ways as a sum of consecutive naturals, for example, 1644 + ... + 1883.

It is an arithmetic number, because the mean of its divisors is an integer number (39690).

2⁴²³²⁴⁰ is an apocalyptic number.

423240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

423240 is an abundant number, since it is smaller than the sum of its proper divisors (846840).

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

423240 is a wasteful number, since it uses less digits than its factorization.

423240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3541 (or 3537 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 15.

The square root of 423240 is about 650.5689817383. The cubic root of 423240 is about 75.0808018052.

Adding to 423240 its reverse (42324), we get a palindrome (465564).

The spelling of 423240 in words is "four hundred twenty-three thousand, two hundred forty", and thus it is an iban number.