19540216 has 8 divisors (see below), whose sum is σ = 36637920. Its totient is φ = 9770104.

The previous prime is 19540211. The next prime is 19540223. The reversal of 19540216 is 61204591.

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19540211) 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 as a sum of consecutive naturals, namely, 1221256 + ... + 1221271.

It is an arithmetic number, because the mean of its divisors is an integer number (4579740).

Almost surely, 2^19540216 is an apocalyptic number.

It is an amenable number.

19540216 is a deficient number, since it is larger than the sum of its proper divisors (17097704).

19540216 is a wasteful number, since it uses less digits than its factorization.

19540216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2442533 (or 2442529 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 19540216 is about 4420.4316531307. The cubic root of 19540216 is about 269.3455388275.

The spelling of 19540216 in words is "nineteen million, five hundred forty thousand, two hundred sixteen".