40208642 has 8 divisors (see below), whose sum is σ = 60697596. Its totient is φ = 19976112.

The previous prime is 40208593. The next prime is 40208647. The reversal of 40208642 is 24680204.

It can be written as a sum of positive squares in 2 ways, for example, as 40208281 + 361 = 6341^2 + 19^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (40208647) 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, 63713 + ... + 64340.

Almost surely, 2^40208642 is an apocalyptic number.

40208642 is a deficient number, since it is larger than the sum of its proper divisors (20488954).

40208642 is a wasteful number, since it uses less digits than its factorization.

40208642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128212.

The product of its (nonzero) digits is 3072, while the sum is 26.

The square root of 40208642 is about 6341.0284654778. The cubic root of 40208642 is about 342.5887797985.

Adding to 40208642 its reverse (24680204), we get a palindrome (64888846).

The spelling of 40208642 in words is "forty million, two hundred eight thousand, six hundred forty-two".