40512240 has 60 divisors (see below), whose sum is σ = 136056024. Its totient is φ = 10803072.

The previous prime is 40512239. The next prime is 40512247. The reversal of 40512240 is 4221504.

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

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40512247) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27414 + ... + 28853.

Almost surely, 2^40512240 is an apocalyptic number.

40512240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40512240 is an abundant number, since it is smaller than the sum of its proper divisors (95543784).

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

40512240 is a wasteful number, since it uses less digits than its factorization.

40512240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56286 (or 56277 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 40512240 is about 6364.9226232532. The cubic root of 40512240 is about 343.4488650896.

Adding to 40512240 its reverse (4221504), we get a palindrome (44733744).

The spelling of 40512240 in words is "forty million, five hundred twelve thousand, two hundred forty".