19775238 has 32 divisors (see below), whose sum is σ = 47581440. Its totient is φ = 5352480.

The previous prime is 19775237. The next prime is 19775269. The reversal of 19775238 is 83257791.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 19775238.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19775237) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11593 + ... + 13188.

It is an arithmetic number, because the mean of its divisors is an integer number (1486920).

Almost surely, 2^19775238 is an apocalyptic number.

19775238 is an abundant number, since it is smaller than the sum of its proper divisors (27806202).

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

19775238 is a wasteful number, since it uses less digits than its factorization.

19775238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24812.

The product of its digits is 105840, while the sum is 42.

The square root of 19775238 is about 4446.9357989519. The cubic root of 19775238 is about 270.4210987324.

The spelling of 19775238 in words is "nineteen million, seven hundred seventy-five thousand, two hundred thirty-eight".