450140240 has 40 divisors (see below), whose sum is σ = 1141721568. Its totient is φ = 163687040.

The previous prime is 450140239. The next prime is 450140281. The reversal of 450140240 is 42041054.

It is a tau number, because it is divible by the number of its divisors (40).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 254882 + ... + 256641.

Almost surely, 2^450140240 is an apocalyptic number.

450140240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

450140240 is an abundant number, since it is smaller than the sum of its proper divisors (691581328).

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

450140240 is a wasteful number, since it uses less digits than its factorization.

450140240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511547 (or 511541 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 450140240 is about 21216.5086666021. The cubic root of 450140240 is about 766.3890294846.

Adding to 450140240 its reverse (42041054), we get a palindrome (492181294).

The spelling of 450140240 in words is "four hundred fifty million, one hundred forty thousand, two hundred forty".