40648657 has 16 divisors (see below), whose sum is σ = 50483200. Its totient is φ = 31939920.

The previous prime is 40648639. The next prime is 40648661. The reversal of 40648657 is 75684604.

It is not a de Polignac number, because 40648657 - 2¹⁵ = 40615889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40648627) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 807 + ... + 9052.

It is an arithmetic number, because the mean of its divisors is an integer number (3155200).

Almost surely, 2^40648657 is an apocalyptic number.

It is an amenable number.

40648657 is a deficient number, since it is larger than the sum of its proper divisors (9834543).

40648657 is a wasteful number, since it uses less digits than its factorization.

40648657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9916.

The product of its (nonzero) digits is 161280, while the sum is 40.

The square root of 40648657 is about 6375.6299296619. The cubic root of 40648657 is about 343.8339320339.

It can be divided in two parts, 4064 and 8657, that added together give a palindrome (12721).

The spelling of 40648657 in words is "forty million, six hundred forty-eight thousand, six hundred fifty-seven".