19842390 has 24 divisors (see below), whose sum is σ = 51590448. Its totient is φ = 5291280.

The previous prime is 19842379. The next prime is 19842391. The reversal of 19842390 is 9324891.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19842391) 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 11 ways as a sum of consecutive naturals, for example, 110146 + ... + 110325.

It is an arithmetic number, because the mean of its divisors is an integer number (2149602).

Almost surely, 2^19842390 is an apocalyptic number.

19842390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19842390 is an abundant number, since it is smaller than the sum of its proper divisors (31748058).

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

19842390 is a wasteful number, since it uses less digits than its factorization.

19842390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220484 (or 220481 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 19842390 is about 4454.4797676047. The cubic root of 19842390 is about 270.7268481315.

The spelling of 19842390 in words is "nineteen million, eight hundred forty-two thousand, three hundred ninety".