40207520 has 24 divisors (see below), whose sum is σ = 94990644. Its totient is φ = 16082944.

The previous prime is 40207507. The next prime is 40207523. The reversal of 40207520 is 2570204.

It can be written as a sum of positive squares in 2 ways, for example, as 38390416 + 1817104 = 6196^2 + 1348^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 40207492 and 40207501.

It is not an unprimeable number, because it can be changed into a prime (40207523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125489 + ... + 125808.

Almost surely, 2^40207520 is an apocalyptic number.

40207520 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40207520 is an abundant number, since it is smaller than the sum of its proper divisors (54783124).

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

40207520 is a wasteful number, since it uses less digits than its factorization.

40207520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251312 (or 251304 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 20.

The square root of 40207520 is about 6340.9399934079. The cubic root of 40207520 is about 342.5855931851.

Adding to 40207520 its reverse (2570204), we get a palindrome (42777724).

The spelling of 40207520 in words is "forty million, two hundred seven thousand, five hundred twenty".