40684647 has 4 divisors (see below), whose sum is σ = 54246200. Its totient is φ = 27123096.

The previous prime is 40684639. The next prime is 40684649. The reversal of 40684647 is 74648604.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 40684647 - 2³ = 40684639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40684649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6780772 + ... + 6780777.

It is an arithmetic number, because the mean of its divisors is an integer number (13561550).

Almost surely, 2^40684647 is an apocalyptic number.

40684647 is a deficient number, since it is larger than the sum of its proper divisors (13561553).

40684647 is a wasteful number, since it uses less digits than its factorization.

40684647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13561552.

The product of its (nonzero) digits is 129024, while the sum is 39.

The square root of 40684647 is about 6378.4517713941. The cubic root of 40684647 is about 343.9353780496.

The spelling of 40684647 in words is "forty million, six hundred eighty-four thousand, six hundred forty-seven".