40579981 has 8 divisors (see below), whose sum is σ = 45601920. Its totient is φ = 35829552.

The previous prime is 40579963. The next prime is 40580011. The reversal of 40579981 is 18997504.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 40579981 - 2⁵ = 40579949 is a prime.

It is a super-2 number, since 2×40579981² = 3293469715920722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40579921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67561 + ... + 68158.

It is an arithmetic number, because the mean of its divisors is an integer number (5700240).

Almost surely, 2^40579981 is an apocalyptic number.

It is an amenable number.

40579981 is a deficient number, since it is larger than the sum of its proper divisors (5021939).

40579981 is a wasteful number, since it uses less digits than its factorization.

40579981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135755.

The product of its (nonzero) digits is 90720, while the sum is 43.

The square root of 40579981 is about 6370.2418321442. The cubic root of 40579981 is about 343.6401868075.

The spelling of 40579981 in words is "forty million, five hundred seventy-nine thousand, nine hundred eighty-one".