40420681 has 8 divisors (see below), whose sum is σ = 46428800. Its totient is φ = 34471008.

The previous prime is 40420669. The next prime is 40420691. The reversal of 40420681 is 18602404.

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 40420681 - 2⁷ = 40420553 is a prime.

It is a super-2 number, since 2×40420681² = 3267662905007522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40420651) 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 7 ways as a sum of consecutive naturals, for example, 13116 + ... + 15901.

It is an arithmetic number, because the mean of its divisors is an integer number (5803600).

Almost surely, 2^40420681 is an apocalyptic number.

It is an amenable number.

40420681 is a deficient number, since it is larger than the sum of its proper divisors (6008119).

40420681 is a wasteful number, since it uses less digits than its factorization.

40420681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29223.

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 40420681 is about 6357.7260872107. The cubic root of 40420681 is about 343.1899346695.

The spelling of 40420681 in words is "forty million, four hundred twenty thousand, six hundred eighty-one".