40720686 has 16 divisors (see below), whose sum is σ = 85728000. Its totient is φ = 12859128.

The previous prime is 40720681. The next prime is 40720703. The reversal of 40720686 is 68602704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40720681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 178486 + ... + 178713.

It is an arithmetic number, because the mean of its divisors is an integer number (5358000).

Almost surely, 2^40720686 is an apocalyptic number.

40720686 is an abundant number, since it is smaller than the sum of its proper divisors (45007314).

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

40720686 is a wasteful number, since it uses less digits than its factorization.

40720686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357223.

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 40720686 is about 6381.2762046475. The cubic root of 40720686 is about 344.0369022518.

The spelling of 40720686 in words is "forty million, seven hundred twenty thousand, six hundred eighty-six".