19019139890 has 16 divisors (see below), whose sum is σ = 35414950680. Its totient is φ = 7345322880.

The previous prime is 19019139883. The next prime is 19019139911. The reversal of 19019139890 is 9893191091.

It can be written as a sum of positive squares in 4 ways, for example, as 18888928969 + 130210921 = 137437^2 + 11411^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32791331 + ... + 32791910.

Almost surely, 2^19019139890 is an apocalyptic number.

19019139890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19019139890 is a deficient number, since it is larger than the sum of its proper divisors (16395810790).

19019139890 is a wasteful number, since it uses less digits than its factorization.

19019139890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65583277.

The product of its (nonzero) digits is 157464, while the sum is 50.

The spelling of 19019139890 in words is "nineteen billion, nineteen million, one hundred thirty-nine thousand, eight hundred ninety".