40978581 has 16 divisors (see below), whose sum is σ = 62794368. Its totient is φ = 23284800.

The previous prime is 40978579. The next prime is 40978583. The reversal of 40978581 is 18587904.

It is an interprime number because it is at equal distance from previous prime (40978579) and next prime (40978583).

It is not a de Polignac number, because 40978581 - 2¹ = 40978579 is a prime.

It is a super-2 number, since 2×40978581² = 3358488201547122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40978583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1590 + ... + 9191.

It is an arithmetic number, because the mean of its divisors is an integer number (3924648).

Almost surely, 2^40978581 is an apocalyptic number.

It is an amenable number.

40978581 is a deficient number, since it is larger than the sum of its proper divisors (21815787).

40978581 is a wasteful number, since it uses less digits than its factorization.

40978581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10972.

The product of its (nonzero) digits is 80640, while the sum is 42.

The square root of 40978581 is about 6401.4514760326. The cubic root of 40978581 is about 344.7616669406.

The spelling of 40978581 in words is "forty million, nine hundred seventy-eight thousand, five hundred eighty-one".