1423440240 has 80 divisors (see below), whose sum is σ = 4416601248. Its totient is φ = 379245568.

The previous prime is 1423440229. The next prime is 1423440323. The reversal of 1423440240 is 420443241.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 1423440240.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 385282 + ... + 388958.

Almost surely, 2^1423440240 is an apocalyptic number.

1423440240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1423440240 is an abundant number, since it is smaller than the sum of its proper divisors (2993161008).

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

1423440240 is a wasteful number, since it uses less digits than its factorization.

1423440240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5306 (or 5300 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 24.

The square root of 1423440240 is about 37728.5069940489. The cubic root of 1423440240 is about 1124.8978317094.

Adding to 1423440240 its reverse (420443241), we get a palindrome (1843883481).

The spelling of 1423440240 in words is "one billion, four hundred twenty-three million, four hundred forty thousand, two hundred forty".