19242390 has 16 divisors (see below), whose sum is σ = 46181808. Its totient is φ = 5131296.

The previous prime is 19242367. The next prime is 19242397. The reversal of 19242390 is 9324291.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 641413 = 19242390 / (1 + 9 + 2 + 4 + 2 + 3 + 9 + 0).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19242397) 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 7 ways as a sum of consecutive naturals, for example, 320677 + ... + 320736.

It is an arithmetic number, because the mean of its divisors is an integer number (2886363).

Almost surely, 2^19242390 is an apocalyptic number.

19242390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19242390 is an abundant number, since it is smaller than the sum of its proper divisors (26939418).

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

19242390 is a wasteful number, since it uses less digits than its factorization.

19242390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 641423.

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 19242390 is about 4386.6148679819. The cubic root of 19242390 is about 267.9700995081.

The spelling of 19242390 in words is "nineteen million, two hundred forty-two thousand, three hundred ninety".