40684021 has 8 divisors (see below), whose sum is σ = 46538240. Its totient is φ = 34840368.

The previous prime is 40683991. The next prime is 40684051. The reversal of 40684021 is 12048604.

It is an interprime number because it is at equal distance from previous prime (40683991) and next prime (40684051).

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 40684021 - 2⁷ = 40683893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40684051) 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, 9115 + ... + 12823.

It is an arithmetic number, because the mean of its divisors is an integer number (5817280).

Almost surely, 2^40684021 is an apocalyptic number.

It is an amenable number.

40684021 is a deficient number, since it is larger than the sum of its proper divisors (5854219).

40684021 is a wasteful number, since it uses less digits than its factorization.

40684021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5283.

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

The square root of 40684021 is about 6378.4026997360. The cubic root of 40684021 is about 343.9336140373.

The spelling of 40684021 in words is "forty million, six hundred eighty-four thousand, twenty-one".