40307640 has 32 divisors (see below), whose sum is σ = 120923280. Its totient is φ = 10748672.

The previous prime is 40307639. The next prime is 40307647. The reversal of 40307640 is 4670304.

40307640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 40307640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40307647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 167829 + ... + 168068.

Almost surely, 2^40307640 is an apocalyptic number.

40307640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40307640 is an abundant number, since it is smaller than the sum of its proper divisors (80615640).

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

40307640 is a wasteful number, since it uses less digits than its factorization.

40307640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335911 (or 335907 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 24.

The square root of 40307640 is about 6348.8298134381. The cubic root of 40307640 is about 342.8697128328.

Adding to 40307640 its reverse (4670304), we get a palindrome (44977944).

The spelling of 40307640 in words is "forty million, three hundred seven thousand, six hundred forty".