19281439390 has 16 divisors (see below), whose sum is σ = 34793148240. Its totient is φ = 7693340800.

The previous prime is 19281439337. The next prime is 19281439393. The reversal of 19281439390 is 9393418291.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19281439393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2400160 + ... + 2408179.

It is an arithmetic number, because the mean of its divisors is an integer number (2174571765).

Almost surely, 2^19281439390 is an apocalyptic number.

19281439390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19281439390 is a deficient number, since it is larger than the sum of its proper divisors (15511708850).

19281439390 is a wasteful number, since it uses less digits than its factorization.

19281439390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4808747.

The product of its (nonzero) digits is 419904, while the sum is 49.

The spelling of 19281439390 in words is "nineteen billion, two hundred eighty-one million, four hundred thirty-nine thousand, three hundred ninety".