40780221 has 16 divisors (see below), whose sum is σ = 56383488. Its totient is φ = 26190000.

The previous prime is 40780183. The next prime is 40780241. The reversal of 40780221 is 12208704.

It is not a de Polignac number, because 40780221 - 2⁹ = 40779709 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 40780191 and 40780200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40780241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22470 + ... + 24216.

It is an arithmetic number, because the mean of its divisors is an integer number (3523968).

Almost surely, 2^40780221 is an apocalyptic number.

It is an amenable number.

40780221 is a deficient number, since it is larger than the sum of its proper divisors (15603267).

40780221 is a wasteful number, since it uses less digits than its factorization.

40780221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2032.

The product of its (nonzero) digits is 896, while the sum is 24.

The square root of 40780221 is about 6385.9393201001. The cubic root of 40780221 is about 344.2044850799.

Adding to 40780221 its reverse (12208704), we get a palindrome (52988925).

The spelling of 40780221 in words is "forty million, seven hundred eighty thousand, two hundred twenty-one".