19541916 has 18 divisors (see below), whose sum is σ = 49397712. Its totient is φ = 6513960.

The previous prime is 19541903. The next prime is 19541917. The reversal of 19541916 is 61914591.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 542831 = 19541916 / (1 + 9 + 5 + 4 + 1 + 9 + 1 + 6).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19541917) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 271380 + ... + 271451.

Almost surely, 2^19541916 is an apocalyptic number.

It is an amenable number.

19541916 is an abundant number, since it is smaller than the sum of its proper divisors (29855796).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19541916 is a wasteful number, since it uses less digits than its factorization.

19541916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 542841 (or 542836 counting only the distinct ones).

The product of its digits is 9720, while the sum is 36.

The square root of 19541916 is about 4420.6239378622. The cubic root of 19541916 is about 269.3533496272.

The spelling of 19541916 in words is "nineteen million, five hundred forty-one thousand, nine hundred sixteen".