19390938 has 16 divisors (see below), whose sum is σ = 44322240. Its totient is φ = 5540256.

The previous prime is 19390933. The next prime is 19390949. The reversal of 19390938 is 83909391.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 461689 = 19390938 / (1 + 9 + 3 + 9 + 0 + 9 + 3 + 8).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 19390938.

It is not an unprimeable number, because it can be changed into a prime (19390933) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 230803 + ... + 230886.

It is an arithmetic number, because the mean of its divisors is an integer number (2770140).

Almost surely, 2^19390938 is an apocalyptic number.

19390938 is an abundant number, since it is smaller than the sum of its proper divisors (24931302).

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

19390938 is a wasteful number, since it uses less digits than its factorization.

19390938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 461701.

The product of its (nonzero) digits is 52488, while the sum is 42.

The square root of 19390938 is about 4403.5142783917. The cubic root of 19390938 is about 268.6578939463.

It can be divided in two parts, 1 and 9390938, that added together give a palindrome (9390939).

The spelling of 19390938 in words is "nineteen million, three hundred ninety thousand, nine hundred thirty-eight".