40440240 has 60 divisors (see below), whose sum is σ = 135814224. Its totient is φ = 10783872.

The previous prime is 40440221. The next prime is 40440259. The reversal of 40440240 is 4204404.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (40440221) and next prime (40440259).

It is a tau number, because it is divible by the number of its divisors (60).

It is a super-2 number, since 2×40440240² = 3270826022515200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27364 + ... + 28803.

Almost surely, 2^40440240 is an apocalyptic number.

40440240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40440240 is an abundant number, since it is smaller than the sum of its proper divisors (95373984).

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

40440240 is a wasteful number, since it uses less digits than its factorization.

40440240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56186 (or 56177 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 18.

The square root of 40440240 is about 6359.2641083698. The cubic root of 40440240 is about 343.2452806736.

Adding to 40440240 its reverse (4204404), we get a palindrome (44644644).

The spelling of 40440240 in words is "forty million, four hundred forty thousand, two hundred forty".