40661390 has 32 divisors (see below), whose sum is σ = 91252224. Its totient is φ = 12673440.

The previous prime is 40661389. The next prime is 40661407. The reversal of 40661390 is 9316604.

40661390 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 25634 + ... + 27173.

It is an arithmetic number, because the mean of its divisors is an integer number (2851632).

Almost surely, 2^40661390 is an apocalyptic number.

40661390 is an abundant number, since it is smaller than the sum of its proper divisors (50590834).

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

40661390 is a wasteful number, since it uses less digits than its factorization.

40661390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52832.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 40661390 is about 6376.6284194706. The cubic root of 40661390 is about 343.8698297382.

Adding to 40661390 its reverse (9316604), we get a palindrome (49977994).

The spelling of 40661390 in words is "forty million, six hundred sixty-one thousand, three hundred ninety".