40686520 has 64 divisors (see below), whose sum is σ = 105177600. Its totient is φ = 13875840.

The previous prime is 40686511. The next prime is 40686571. The reversal of 40686520 is 2568604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 92461 + ... + 92899.

It is an arithmetic number, because the mean of its divisors is an integer number (1643400).

Almost surely, 2^40686520 is an apocalyptic number.

40686520 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 40686520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52588800).

40686520 is an abundant number, since it is smaller than the sum of its proper divisors (64491080).

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

40686520 is a wasteful number, since it uses less digits than its factorization.

40686520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 788 (or 784 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 40686520 is about 6378.5985921674. The cubic root of 40686520 is about 343.9406558889.

The spelling of 40686520 in words is "forty million, six hundred eighty-six thousand, five hundred twenty".