40205780 has 12 divisors (see below), whose sum is σ = 84432180. Its totient is φ = 16082304.

The previous prime is 40205779. The next prime is 40205797. The reversal of 40205780 is 8750204.

It can be written as a sum of positive squares in 2 ways, for example, as 12475024 + 27730756 = 3532^2 + 5266^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1005125 + ... + 1005164.

It is an arithmetic number, because the mean of its divisors is an integer number (7036015).

Almost surely, 2^40205780 is an apocalyptic number.

It is an amenable number.

40205780 is an abundant number, since it is smaller than the sum of its proper divisors (44226400).

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

40205780 is a wasteful number, since it uses less digits than its factorization.

40205780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2010298 (or 2010296 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 26.

The square root of 40205780 is about 6340.8027882911. The cubic root of 40205780 is about 342.5806512610.

Adding to 40205780 its reverse (8750204), we get a palindrome (48955984).

The spelling of 40205780 in words is "forty million, two hundred five thousand, seven hundred eighty".