40165520 has 40 divisors (see below), whose sum is σ = 95156856. Its totient is φ = 15761408.

The previous prime is 40165501. The next prime is 40165561. The reversal of 40165520 is 2556104.

It can be written as a sum of positive squares in 4 ways, for example, as 18524416 + 21641104 = 4304^2 + 4652^2 .

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

It is a super-2 number, since 2×40165520² = 3226537993740800, which contains 22 as substring.

It is a congruent number.

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, 497 + ... + 8976.

Almost surely, 2^40165520 is an apocalyptic number.

40165520 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 40165520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47578428).

40165520 is an abundant number, since it is smaller than the sum of its proper divisors (54991336).

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

40165520 is a wasteful number, since it uses less digits than its factorization.

40165520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9539 (or 9533 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 40165520 is about 6337.6273162754. The cubic root of 40165520 is about 342.4662655250.

The spelling of 40165520 in words is "forty million, one hundred sixty-five thousand, five hundred twenty".