11901638 has 32 divisors (see below), whose sum is σ = 21738240. Its totient is φ = 4773600.

The previous prime is 11901623. The next prime is 11901647. The reversal of 11901638 is 83610911.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 11901638.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26645 + ... + 27087.

It is an arithmetic number, because the mean of its divisors is an integer number (679320).

Almost surely, 2^11901638 is an apocalyptic number.

11901638 is a deficient number, since it is larger than the sum of its proper divisors (9836602).

11901638 is a wasteful number, since it uses less digits than its factorization.

11901638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 572.

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 11901638 is about 3449.8750702018. The cubic root of 11901638 is about 228.3155960908.

The spelling of 11901638 in words is "eleven million, nine hundred one thousand, six hundred thirty-eight".