40645240 has 64 divisors (see below), whose sum is σ = 97264800. Its totient is φ = 15257088.

The previous prime is 40645229. The next prime is 40645261. The reversal of 40645240 is 4254604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42447 + ... + 43393.

Almost surely, 2^40645240 is an apocalyptic number.

40645240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40645240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48632400).

40645240 is an abundant number, since it is smaller than the sum of its proper divisors (56619560).

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

40645240 is a wasteful number, since it uses less digits than its factorization.

40645240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1024 (or 1020 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 25.

The square root of 40645240 is about 6375.3619505092. The cubic root of 40645240 is about 343.8242973288.

Adding to 40645240 its reverse (4254604), we get a palindrome (44899844).

The spelling of 40645240 in words is "forty million, six hundred forty-five thousand, two hundred forty".