243430040 has 48 divisors (see below), whose sum is σ = 637146000. Its totient is φ = 83461056.

The previous prime is 243430037. The next prime is 243430043. The reversal of 243430040 is 40034342.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (243430037) and next prime (243430043).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 243429994 and 243430021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243430043) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 60140 + ... + 64059.

It is an arithmetic number, because the mean of its divisors is an integer number (13273875).

Almost surely, 2^243430040 is an apocalyptic number.

243430040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243430040 is an abundant number, since it is smaller than the sum of its proper divisors (393715960).

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

243430040 is a wasteful number, since it uses less digits than its factorization.

243430040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124224 (or 124213 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 20.

The square root of 243430040 is about 15602.2447102973. The cubic root of 243430040 is about 624.3930448929.

Adding to 243430040 its reverse (40034342), we get a palindrome (283464382).

The spelling of 243430040 in words is "two hundred forty-three million, four hundred thirty thousand, forty".