240405140 has 24 divisors (see below), whose sum is σ = 517165992. Its totient is φ = 93816320.

The previous prime is 240405097. The next prime is 240405161. The reversal of 240405140 is 41504042.

It can be written as a sum of positive squares in 4 ways, for example, as 3429904 + 236975236 = 1852^2 + 15394^2 .

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, 145769 + ... + 147408.

It is an arithmetic number, because the mean of its divisors is an integer number (21548583).

Almost surely, 2^240405140 is an apocalyptic number.

240405140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

240405140 is an abundant number, since it is smaller than the sum of its proper divisors (276760852).

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

240405140 is a wasteful number, since it uses less digits than its factorization.

240405140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293227 (or 293225 counting only the distinct ones).

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

The square root of 240405140 is about 15505.0037084807. The cubic root of 240405140 is about 621.7959891033.

Adding to 240405140 its reverse (41504042), we get a palindrome (281909182).

The spelling of 240405140 in words is "two hundred forty million, four hundred five thousand, one hundred forty".