40685220 has 96 divisors (see below), whose sum is σ = 128822400. Its totient is φ = 10657152.

The previous prime is 40685191. The next prime is 40685257. The reversal of 40685220 is 2258604.

40685220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31222 + ... + 32498.

It is an arithmetic number, because the mean of its divisors is an integer number (1341900).

Almost surely, 2^40685220 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40685220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64411200).

40685220 is an abundant number, since it is smaller than the sum of its proper divisors (88137180).

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

40685220 is a wasteful number, since it uses less digits than its factorization.

40685220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1354 (or 1346 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 40685220 is about 6378.4966880920. The cubic root of 40685220 is about 343.9369926968.

The spelling of 40685220 in words is "forty million, six hundred eighty-five thousand, two hundred twenty".