19775144 has 16 divisors (see below), whose sum is σ = 37154400. Its totient is φ = 9867312.

The previous prime is 19775123. The next prime is 19775149. The reversal of 19775144 is 44157791.

It is a junction number, because it is equal to n+sod(n) for n = 19775098 and 19775107.

It is not an unprimeable number, because it can be changed into a prime (19775149) 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, 2117 + ... + 6635.

It is an arithmetic number, because the mean of its divisors is an integer number (2322150).

Almost surely, 2^19775144 is an apocalyptic number.

It is an amenable number.

19775144 is a deficient number, since it is larger than the sum of its proper divisors (17379256).

19775144 is a wasteful number, since it uses less digits than its factorization.

19775144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5072 (or 5068 counting only the distinct ones).

The product of its digits is 35280, while the sum is 38.

The square root of 19775144 is about 4446.9252298639. The cubic root of 19775144 is about 270.4206702567.

The spelling of 19775144 in words is "nineteen million, seven hundred seventy-five thousand, one hundred forty-four".