19861424 has 30 divisors (see below), whose sum is σ = 42301980. Its totient is φ = 9027040.

The previous prime is 19861411. The next prime is 19861427. The reversal of 19861424 is 42416891.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (19861427) 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, 3194 + ... + 7065.

It is an arithmetic number, because the mean of its divisors is an integer number (1410066).

Almost surely, 2^19861424 is an apocalyptic number.

It is an amenable number.

19861424 is an abundant number, since it is smaller than the sum of its proper divisors (22440556).

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

19861424 is a wasteful number, since it uses less digits than its factorization.

19861424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10289 (or 10272 counting only the distinct ones).

The product of its digits is 13824, while the sum is 35.

The square root of 19861424 is about 4456.6157563784. The cubic root of 19861424 is about 270.8133862285.

The spelling of 19861424 in words is "nineteen million, eight hundred sixty-one thousand, four hundred twenty-four".