40305240 has 48 divisors (see below), whose sum is σ = 130993200. Its totient is φ = 10747968.

The previous prime is 40305227. The next prime is 40305241. The reversal of 40305240 is 4250304.

It is a happy number.

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 (40305241) 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, 55620 + ... + 56339.

It is an arithmetic number, because the mean of its divisors is an integer number (2729025).

Almost surely, 2^40305240 is an apocalyptic number.

40305240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40305240 is an abundant number, since it is smaller than the sum of its proper divisors (90687960).

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

40305240 is a wasteful number, since it uses less digits than its factorization.

40305240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111976 (or 111969 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 18.

The square root of 40305240 is about 6348.6407994153. The cubic root of 40305240 is about 342.8629076412.

Adding to 40305240 its reverse (4250304), we get a palindrome (44555544).

The spelling of 40305240 in words is "forty million, three hundred five thousand, two hundred forty".