39649638 has 16 divisors (see below), whose sum is σ = 90627840. Its totient is φ = 11328456.

The previous prime is 39649633. The next prime is 39649657. The reversal of 39649638 is 83694693.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39649633) 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, 471978 + ... + 472061.

It is an arithmetic number, because the mean of its divisors is an integer number (5664240).

Almost surely, 2^39649638 is an apocalyptic number.

39649638 is an abundant number, since it is smaller than the sum of its proper divisors (50978202).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

39649638 is a wasteful number, since it uses less digits than its factorization.

39649638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 944051.

The product of its digits is 839808, while the sum is 48.

The square root of 39649638 is about 6296.7958518599. The cubic root of 39649638 is about 340.9937420557.

The spelling of 39649638 in words is "thirty-nine million, six hundred forty-nine thousand, six hundred thirty-eight".