40240240 has 20 divisors (see below), whose sum is σ = 93558744. Its totient is φ = 16096064.

The previous prime is 40240237. The next prime is 40240243. The reversal of 40240240 is 4204204.

It is an interprime number because it is at equal distance from previous prime (40240237) and next prime (40240243).

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40240243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 251422 + ... + 251581.

Almost surely, 2^40240240 is an apocalyptic number.

40240240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40240240 is an abundant number, since it is smaller than the sum of its proper divisors (53318504).

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

40240240 is a wasteful number, since it uses less digits than its factorization.

40240240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 503016 (or 503010 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 16.

The square root of 40240240 is about 6343.5195278331. The cubic root of 40240240 is about 342.6784975417.

Adding to 40240240 its reverse (4204204), we get a palindrome (44444444).

The spelling of 40240240 in words is "forty million, two hundred forty thousand, two hundred forty".