40561520 has 40 divisors (see below), whose sum is σ = 95295984. Its totient is φ = 16054272.

The previous prime is 40561487. The next prime is 40561531. The reversal of 40561520 is 2516504.

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

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, 5147 + ... + 10373.

Almost surely, 2^40561520 is an apocalyptic number.

40561520 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 40561520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47647992).

40561520 is an abundant number, since it is smaller than the sum of its proper divisors (54734464).

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

40561520 is a wasteful number, since it uses less digits than its factorization.

40561520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5337 (or 5331 counting only the distinct ones).

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

The square root of 40561520 is about 6368.7926642339. The cubic root of 40561520 is about 343.5880683032.

The spelling of 40561520 in words is "forty million, five hundred sixty-one thousand, five hundred twenty".