40581390 has 32 divisors (see below), whose sum is σ = 99773856. Its totient is φ = 10557440.

The previous prime is 40581337. The next prime is 40581403. The reversal of 40581390 is 9318504.

40581390 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 (30).

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, 15267 + ... + 17726.

It is an arithmetic number, because the mean of its divisors is an integer number (3117933).

Almost surely, 2^40581390 is an apocalyptic number.

40581390 is an abundant number, since it is smaller than the sum of its proper divisors (59192466).

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

40581390 is a wasteful number, since it uses less digits than its factorization.

40581390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33044.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 40581390 is about 6370.3524235320. The cubic root of 40581390 is about 343.6441640019.

Adding to 40581390 its reverse (9318504), we get a palindrome (49899894).

The spelling of 40581390 in words is "forty million, five hundred eighty-one thousand, three hundred ninety".