40609649 has 4 divisors (see below), whose sum is σ = 40622400. Its totient is φ = 40596900.

The previous prime is 40609637. The next prime is 40609661. The reversal of 40609649 is 94690604.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is an interprime number because it is at equal distance from previous prime (40609637) and next prime (40609661).

It is a cyclic number.

It is not a de Polignac number, because 40609649 - 2⁴ = 40609633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40609249) 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, 2924 + ... + 9474.

It is an arithmetic number, because the mean of its divisors is an integer number (10155600).

Almost surely, 2^40609649 is an apocalyptic number.

It is an amenable number.

40609649 is a deficient number, since it is larger than the sum of its proper divisors (12751).

40609649 is an equidigital number, since it uses as much as digits as its factorization.

40609649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12750.

The product of its (nonzero) digits is 46656, while the sum is 38.

The square root of 40609649 is about 6372.5700466923. The cubic root of 40609649 is about 343.7239114526.

The spelling of 40609649 in words is "forty million, six hundred nine thousand, six hundred forty-nine".