19742144 has 28 divisors (see below), whose sum is σ = 39328344. Its totient is φ = 9832704.

The previous prime is 19742143. The next prime is 19742171. The reversal of 19742144 is 44124791.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a self number, because there is not a number n which added to its sum of digits gives 19742144.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19742141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23459 + ... + 24285.

Almost surely, 2^19742144 is an apocalyptic number.

It is an amenable number.

19742144 is a deficient number, since it is larger than the sum of its proper divisors (19586200).

19742144 is an equidigital number, since it uses as much as digits as its factorization.

19742144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1212 (or 1202 counting only the distinct ones).

The product of its digits is 8064, while the sum is 32.

The square root of 19742144 is about 4443.2132516907. The cubic root of 19742144 is about 270.2701639668.

The spelling of 19742144 in words is "nineteen million, seven hundred forty-two thousand, one hundred forty-four".