19870201 has 8 divisors (see below), whose sum is σ = 21750344. Its totient is φ = 18040320.

The previous prime is 19870187. The next prime is 19870217. The reversal of 19870201 is 10207891.

It can be written as a sum of positive squares in 4 ways, for example, as 1207801 + 18662400 = 1099^2 + 4320^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 19870201 - 2¹³ = 19862009 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19870201.

It is not an unprimeable number, because it can be changed into a prime (19870231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11736 + ... + 13321.

It is an arithmetic number, because the mean of its divisors is an integer number (2718793).

Almost surely, 2^19870201 is an apocalyptic number.

It is an amenable number.

19870201 is a deficient number, since it is larger than the sum of its proper divisors (1880143).

19870201 is a wasteful number, since it uses less digits than its factorization.

19870201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25131.

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 19870201 is about 4457.6003634242. The cubic root of 19870201 is about 270.8532722415.

It can be divided in two parts, 1987020 and 1, that added together give a triangular number (1987021 = T₁₉₉₃).

The spelling of 19870201 in words is "nineteen million, eight hundred seventy thousand, two hundred one".