40016520 has 96 divisors (see below), whose sum is σ = 134573400. Its totient is φ = 10300416.

The previous prime is 40016507. The next prime is 40016563. The reversal of 40016520 is 2561004.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 27185796 + 12830724 = 5214^2 + 3582^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 40016493 and 40016502.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8524 + ... + 12356.

Almost surely, 2^40016520 is an apocalyptic number.

40016520 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 40016520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67286700).

40016520 is an abundant number, since it is smaller than the sum of its proper divisors (94556880).

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

40016520 is a wasteful number, since it uses less digits than its factorization.

40016520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3879 (or 3872 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 40016520 is about 6325.8612061916. The cubic root of 40016520 is about 342.0422641930.

Adding to 40016520 its reverse (2561004), we get a palindrome (42577524).

The spelling of 40016520 in words is "forty million, sixteen thousand, five hundred twenty".