19949901 has 8 divisors (see below), whose sum is σ = 27756480. Its totient is φ = 12721632.

The previous prime is 19949899. The next prime is 19949911. The reversal of 19949901 is 10994991.

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

It is not a de Polignac number, because 19949901 - 2¹ = 19949899 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19949911) 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, 144496 + ... + 144633.

It is an arithmetic number, because the mean of its divisors is an integer number (3469560).

Almost surely, 2^19949901 is an apocalyptic number.

It is an amenable number.

19949901 is a deficient number, since it is larger than the sum of its proper divisors (7806579).

19949901 is a wasteful number, since it uses less digits than its factorization.

19949901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289155.

The product of its (nonzero) digits is 26244, while the sum is 42.

The square root of 19949901 is about 4466.5312044136. The cubic root of 19949901 is about 271.2149228003.

It can be divided in two parts, 1994990 and 1, that added together give a palindrome (1994991).

The spelling of 19949901 in words is "nineteen million, nine hundred forty-nine thousand, nine hundred one".