40507440 has 40 divisors (see below), whose sum is σ = 125573808. Its totient is φ = 10801920.

The previous prime is 40507429. The next prime is 40507451. The reversal of 40507440 is 4470504.

It is an interprime number because it is at equal distance from previous prime (40507429) and next prime (40507451).

It is a tau number, because it is divible by the number of its divisors (40).

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 40507440.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84151 + ... + 84630.

Almost surely, 2^40507440 is an apocalyptic number.

40507440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40507440 is an abundant number, since it is smaller than the sum of its proper divisors (85066368).

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

40507440 is a wasteful number, since it uses less digits than its factorization.

40507440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168797 (or 168791 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 24.

The square root of 40507440 is about 6364.5455454416. The cubic root of 40507440 is about 343.4353003030.

Adding to 40507440 its reverse (4470504), we get a palindrome (44977944).

The spelling of 40507440 in words is "forty million, five hundred seven thousand, four hundred forty".