19009000 has 32 divisors (see below), whose sum is σ = 44483400. Its totient is φ = 7603200.

The previous prime is 19008991. The next prime is 19009013. The reversal of 19009000 is 90091.

It can be written as a sum of positive squares in 4 ways, for example, as 9036036 + 9972964 = 3006^2 + 3158^2 .

It is a super-2 number, since 2×19009000² = 722684162000000, which contains 22 as substring.

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, 8505 + ... + 10504.

Almost surely, 2^19009000 is an apocalyptic number.

19009000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19009000 is an abundant number, since it is smaller than the sum of its proper divisors (25474400).

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

19009000 is a wasteful number, since it uses less digits than its factorization.

19009000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19030 (or 19016 counting only the distinct ones).

The product of its (nonzero) digits is 81, while the sum is 19.

The square root of 19009000 is about 4359.9311921176. The cubic root of 19009000 is about 266.8822908790.

Adding to 19009000 its reverse (90091), we get a palindrome (19099091).

The spelling of 19009000 in words is "nineteen million, nine thousand".