40720185 has 64 divisors (see below), whose sum is σ = 83669760. Its totient is φ = 18570240.

The previous prime is 40720181. The next prime is 40720187. The reversal of 40720185 is 58102704.

It is not a de Polignac number, because 40720185 - 2² = 40720181 is a prime.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (40720181) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 24439 + ... + 26051.

It is an arithmetic number, because the mean of its divisors is an integer number (1307340).

Almost surely, 2^40720185 is an apocalyptic number.

40720185 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

40720185 is an abundant number, since it is smaller than the sum of its proper divisors (42949575).

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

40720185 is a wasteful number, since it uses less digits than its factorization.

40720185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1655 (or 1649 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 40720185 is about 6381.2369490562. The cubic root of 40720185 is about 344.0354913129.

Adding to 40720185 its reverse (58102704), we get a palindrome (98822889).

The spelling of 40720185 in words is "forty million, seven hundred twenty thousand, one hundred eighty-five".